- you surely can use the pod as a stompbox modeler;
if you can't switch channels on your amp, you will have to use the pod distortions
- but if are not satisfied with the pod's distortions into the input of your amp,
which I think is the case, because otherwise you wouldn't have tried the pod amps and posted here, would you? :-) ...
...so if you are not satisfied and if your amp has an effects return input you can use the pod amps, as radatats suggested
but remember that you'll have to LEARN those amps AND experiment with preamps with and without cab/mic and also full amps with and without cab/mic and all this in combination with the output modes (Combo Power Amp, Stack Power Amp and Studio/Direct should be the ones to try out);
this can be FUN for someone or BAD for others (I'm on the "fun" side ;-))
- then, as a sound eng., I'd ask you:
how do you connect the XLR you have on stage to the amp's input? with a reamp box?
please tell me you're not using an XLR to jack adapter cable!
pod > XLR mic level out > mic preamp > reamp box > "single channel" amp > microphone > consolle > PA
a setup like this is the only one that will correctly drive your amp's input
and, if you use the return of the amp, you can only bypass the reamp box in that chain
- all that said I would change approach and ask: why not try the pod directly into the PA?
this is what I would do.
The only benefit of using a real amp is having it on stage as a perfect monitor for you,
but you're putting the amp "in an isolation closet off stage", so...
this way you'll also have to learn the amps to choose your favourites, but you can peacefully choose full amps with cab/mics and Studio/Direct output mode
AND you can create the sounds at home with more confidence that they will sound similar on stage
hope to be helpful