Hi Egbert, first of all BIG thanks for the matches You've already provide!
As for RISC 2500: its only my personal opinion of course, but I think, that this device can definately do its best with STYLE: OFFENSIVE and 512 kb RAM onboard (384 of it will go for Hash Tables)
Maybe, You'll be able to do next match with these settings + Montreux eprom inside ?
Good luck anyway!