No. The entire premise of amortized analysis is to get a more optimistic "eventually O" number. "Eventually" is not good enough for real time. Yes you can get a real hard worst-case number, but that's a different analysis from amortized analysis. Unless all of your amortized operations are happening between deadlines, it's useless--worse, dangerous--for safety. And amortized analysis is almost never used that way. You don't have language run-times that reinitialize between every deadline.
I somehow confused myself by thinking of it in terms of one of the proof techniques for amortized worst case where you derive a fixed upper bound for any "n". Of course this is a much stronger property than needed.
