You might be interested in Qemu, then.
It's not released to the public yet (it's being done for the Rebirth Competition and thereafter) but it seems to run many games where DOSBox is too slow. Maybe make a request there to see if they'll try it out? I'd definitely be interested to see how this game fares. I never finished it once, though I was never very good at these games (I became a PC gamer a bit too late to get into these).