It's usually pretty easy to build yourself a sturdy channel/reverb footswitch: Most switching circuits just need a simple make/break switch (SPDT). If there is more than one switch, like reverb on/off AND channel change, it will use a stereo plug and you'll need to identify which wires in the cable/plug do what. If it uses a more exotic plug (e.g multipin DIN) it might be a bit more effort than it's worth, but equally it will probably be difficult to replace with anything other than the official Peavey footswitch.
I don't know this particular model, but Peavey are pretty good at providing owners with the schematics for their amps. I own an old late-'70s Peavey Classic tube amp which i bought second-hand without a footswitch - I emailed them, and they sent me the circuit diagram which showed which contacts on the 5-pin DIN socket bypassed the reverb and tremelo parts of the circuit - And therefore which wires to connect to the switch contacts.