keep in mind that Leapfrog Leapster will require me to actually write the Arcompact CPU core one day, and if I've learned one thing over the years it's that I suck at writing CPU cores; I should just nuke what I have and start again, the idea was to eventually convert what was there to a generation script that processed files describing the opcodes, but at the moment it's just a shitty generator that outputs a hardcoded set of stuff and doesn't have all the opcodes with a weird DASM format that is still as it is because I was in the process of trying to understand the opcodes myself and log any unused bits (because it's a really annoying and inefficient instruction set where half the opcodes have 'don't care' or 'don't set' or 'reserved' bits etc.)
There's a chance any rom dumped from it will match what we already have.
In terms of 'likely to see emulated anytime soon' Leapster is pretty low down.