It is worth mentioning that many people (including me) keep isopods as decorative animals in their own enclosure. This can be as simple as a 6qt plastic box, a clear Critter Keeper (I use both of these), a small fish tank or ExoTerra, or some sort of repurposed decorative glass vessel. They're a lot of fun to keep this way, and it would eliminate both the routine disposal worry/hassles and modifications of another animal's enclosure for the purposes of what is looking to be pretty close to cohabitation.
Just a thought.