For whatever reason; ether after a injury or when getting a really bad cold, Jack ask the grown-up Raf to take over as Spiderman or as the countries main hero for the week.
How does Raf take it? Is he up for the job?
Well, not really as Raf is still 12 in this AU and he is not the athletic type to take the roll...
If he does he would built a robot that looks exactly like Jack but he would control it remotely.
Other options Jack has for replacing him are:
Cody Burns, they have met and Jack sees a lot of potential in him, he is strong but he still needs to be a little older for this kind of task.
Sari Sumdac, she is also 12 but she is more athletic and braver for the job, she is also Tony stark adopted daughter so she has the money on her side.
Miko Nakadai is an option too, she just needs to behave...
Vince, he is still alive and forgives Jack in the future for what happened to his dad, but instead of using the Spider-Man costume, he would use a power armor called Patrioteer.
A more extreme option would be his girlfriend Sierra, but it would have to be as a last resort.