I think I found my favorite BTS photo of Michael as Betelgeuse in BJBJ. (It looks grainy because I took a screenshot from a YouTube video and then cropped and zoomed 😆).
Look at ✨him✨.
Ok, so we all agree that Betelgeuse and Lydia must have run across each other occasionally during work, right? Not that she could see him, but he almost definitely was responsible for some of those "evil presences" she felt.
Now consider:
Richard said that he was checking in on Astrid and Lydia all the time, even though he knows they can't see him. Betel was very strongly implied to have done the same, and was still stalking them throughout BJBJ.
Richard and Betelgeuse very definitely can see each other.
I'd be very interested to know how those run-ins went. Probably awkward af.
Theory why Betelgeuse left Lydia's side to "go to the little boys' room" and took over for Richard at his booth for a bit:
Yes, he could have dealt with Jeremy without playing dress-up and taking over Richard's job, and didn't have to enable Richy to get a little more family time in the process. They could have saved Astrid just fine without that, so it seems unnecessary, for him to do that. OOC, even. Except
2) Richard wouldn't owe Betelgeuse a big favor for said taking over of his job and enabling the extra family time with Lydia and Astrid. Also, ofc, for saving his daughter from trading places with Jeremy. Betelgeuse did all that at great cost to himself: A Code 699 violation (see screenshot of transcript from reddit below) gets you extra time working as a civil servant, it gets your topside privileges revoked, and it voids any marriage you entered into, so his contract for payment from/marriage to Lydia was meaningless (well, if it had been a marriage certificate rather than just an agreement to get married in the future. and if he'd actually signed it. and then possibly only if he'd signed it before entering the Netherworld so there'd be a marriage TO void, rather than... not signing it at all... *sigh* he totally burned that half-signed and not-yet-binding contract himself bc he understood she wasn't ready to marry him yet, is what I'm saying, but I digress).
1) Lydia wouldn't have gotten closure for her ex's death without it. Closure which she sorely needed, because the fact that Richard's body was never found plus her seeming inability to see his ghost (Richard: "I know you two can't see me, but I check in on you all the time") add up to her having been in denial of his death. She couldn't see his ghost because she really really did not want to see proof that he was dead. So now she gets to move on from him. Which is very convenient for B. Especially as Richard is unlikely to be able to visit her anytime soon even now that Lydia has accepted his death and should be able to see him again, but I'm getting to that.
Still 2): Anyway, B doesn't do favors. He does business. If people are allowed to take over for others at their jobs in the afterlife, but those jobs are also a form of punishment where you have to "do time" at them for a specific duration, then those work hours are a currency that you can give away or trade. You can, if you find someone who is willing, get someone to do your time for you (hell, you can even get a naive Breather to trade their actual Life for your afterlife existence).
So yeah, I don't think Betelgeuse took over Richard's booth just out of the goodness of his heart. I think they made a deal, one that means that B will be topside again much sooner than the Deetz' will expect so he can get back to trying to seduce Richard's ex (hey, Richard always supported lost causes, so... 😆), while Richard will be stuck at work, unable to visit the Living for a long and unspecified amount of time. Not that his family's gonna notice, bc they never used to see him visit them, anyway.
And yeah, according to someone from reddit who decyphered that page in the Handbook, there's a bit about how the Deceased who violated Code 699 has to cease Trading, if applicable.
But I think that only goes for post-conviction of the crime, not as an automatic consequence of the crime, as B was also still able to visit the Living World to attempt the church wedding. Which, actually, is yet more evidence that this latest marriage attempt was more for the sake of declaring his feelings and testing the waters (and showing off, and getting rid at the competition) than him trying to actually get, and stay, married. Cause the church wedding would have been voided by a conviction, too.
Anyway, that's my theory on B's incredibly considerate, and therefore incredibly suspicious, detour to Richard's booth and letting Richard have his heroic moment.
And tbf, Lydia and Astrid are Richard's family. So it wouldn't even be unreasonable to expect Richard to pay for the legal trouble B got into from saving them. Like, I'm sure he'd have done it anyway, but if B can pass on that buck then ofc he's gonna.