It's actually a shame that the other Marl Kingdom games didn't get onto the PSP! Marl Kingdom is supposed to actually have a half-decent following on the Japan side, and La Pucelle is a spin-off of the series in the first place. Homard, for instance, is actually the child of the heroine of Little Princess, the second Marl Kingdom game, Kururu. And Elly, the DLC character of LPR and who appears in the Rosenqueen Shop, appears in the first chapter of Angel's Present, the third game. Heck, Rosenqueen itself started in Marl Kingdom, in Rhapsody!
I think it'd be at least definitely interesting that more people would get to play at least one of the games, even if it's just the menus. It'd probably be really hard to do any full translations, since there's not too much to base it off of, and would probably require at least one or two more dedicated translators.