I'd say that, for now, you should stick to PC98 if it's so easy for you to hack your translation into these games. PC 98 doesn't have a lot of proper (and non-hentai) RPGs, right?
I mean, Phantasie IV, Lunatic Dawn 1&2 and Last Armageddon are the main ones - but then there are also:
Quarterstaff - The Tomb of Setmoth (from StarCraft, the same company that released Phantasie IV):
http://fullmotionvideo.free.fr/screen/G2837.html
Rogue Alliance (again by the same company):
http://fullmotionvideo.free.fr/screen/G2963.html
TO-KY-O (looks fucking great, reminds me of 2400 A.D. - and again by StarCraft Inc.):
http://fullmotionvideo.free.fr/screen/G3650.html
Illusion City:
http://fullmotionvideo.free.fr/screen/G1595.html
Insiders 2:
http://fullmotionvideo.free.fr/screen/G1619.html
And that's pretty much it. See, not so many
On a more serious note, if you translate even if a couple of these it'd be awesomely awesome. I think you should prioritize simpler games - Phantasie IV or Last Armageddon or anything by StarCraft would be the logical next projects to tackle, imho. Just look at this:
http://fullmotionvideo.free.fr/screen/G2640.html !!