For sure it is possible!
physical access is not the problem.
Access also not the problem most routers have defaultpasswords.
You can ask them all nicely and bring up a nice story, why you want to access the router.
(e.g. disable wlan at night for better sleep lol or referring to this dangerous attack/bug/virus etc and check on things…)
Most older People aren’t using anything after they setup their router once.
Just get access, setup portforwarding physically and done. No Problem in most cases! Else move on.
25$ per constant valueble real Elite Proxie, is still worth it. Real Identity.
The Problem is to have a stick ready that is setup and You can access it remotely.
So what’s the Problem, you never tried a solution like that, did you?
You could try it with your linux laptop first, if you find a solution there it is probably possible to automate that.
So where is your Solution to the problem?