Ah, I think you misunderstood me because I was not very clear. I have a Plus and a 512KE (and a few others, of course). I mainly keep the 512KE accessible because of the Megaroids issue. If the Plus would run Megaroids with 512K or less installed, then I could pack the 512KE away somewhere less accessible and just keep the Plus where I can reach it.
It is not a question of whether to modify a single machine, but rather a matter of space from keeping two similar machines with one key difference.