your best bet would be to get a Game Boy Advance SP 1st version (or just it's screen) + NGPC (preferably the larger version) and find someone to do the mod for you (
if you do not want to perform it yourself). I haven't seen one for sale in a long time. But TBH I wouldn't go through the trouble, it's also a very challenging mod to do if you're not experienced. Get the slim version and play it by a lamb
As for people doing the mod, I think Xian Xi did them once, also gegrago, maybe flavor. Be sure to steer clear of
Rose Colored.