If I were you... I'd invest in an ARcadVGA card from
ultimarc.com but emailing andy first to verify that your monitor model does in fact do standard 15khz res. (if it's ONLY 25khz mid resolution you S.O.L)...
Hopefully the switching is automagic by the monitor (between 15 and 25khz...)
Mame will do the appropriate resolutions at 15khz to match those that the original game (when coupled with ArcadeVGA or with necessary tweaking, advanceMAME, and your old skool ati card) or nearly enough for our purposes =P
Rampy
PS I couldn't find a manual for your monitor online via google... which I thought woulda helped *Shrug*