For the most part, if you've actually adapted it to the screen (which is mostly a matter of making sure it uses bitmaps small enough to fit, a stopgap would be to borrow the mono bitmaps from the Archos targets until someone drew color ones, I imagine), then once the code has the proper #ifdefs in it for the target, its keymapping, and its bitmaps, add it to /apps/plugins/sources (or rather, since it's ifdeffed out in there move it into the right #ifdef block, or change its #ifdef to include the 5gb H10). Then see if it compiles/works.
I'm not sure if I've explained it the best possible, but it's not too hard as long as another target has a smaller screen, or you're willing to redraw the graphics.