You're not wrong here. You get clip-elimination, you get overhead, you get speakers that can handle the abuse. The only thing you'll have to overcome is some of the built-in-EQ coloration and get the pre/gain levels right. The poweramp is likely going to be the same IcePower PWM reference board you find in most bass amps these days.if you want a convenient and affordable drum amp for rehearsing and practice, use a bass guitar amp.
(i'll just pause for the inevitable torrent of abuse...)