Card will be real even if the shot goes in the sink and not the arm...
Seriously, where are you going to find somebody in the medical field willing to risk their career (and jail) to do that? And even if you found somebody to do that, how would you know you are not walking into a sting operation?
I would not recommend that path for anybody (faking a vaccine card). Far better to take a principled stand and REFUSE the shots.