Yes, it's very feasible. Some considerations.
*In series, two 8 Ohm speakers will have an impedance of 16 Ohms. In parallel, two will be 4 Ohms.
*Plastic sockets on a plastic plate will be less problematic than metal sockets on a metal plate.
*May be better to split the cab vertically - just a thought.
*With two different amps, therefore sounds, it ...
If you keep the speakers in series to get 16 ohms, that would match the output impedance of an amp with 16 ohm output. Electrically, this should be just fine. You can go higher ohms without hurting anything (8 to 16 ohms).
Oh, EDIT: If the common of both jacks are on the same plate, that might create problems, depending on the amp(s). So best to insulate ...