"If I were to purchase the new command base, but still wanted to use a hand held remote, I would need to keep the old base for recharging the remote, yes?"
Remotes are set up for alkaline battery power, so do not require recharging unless you use rechargeable batteries. Cab2 command base would no longer be needed for anything is my reading.
"Also, would the two bases interfere with each other (besides competing for limited space on the control panel) in any way?"
No need for two bases and yes, we have always been told no more than one command base per layout. Cab 3 base should be all you would need it seems from the catalog description.
