Bi-Amping question...

If I understand what you want to do correctly, you will have a full range signal going to your bass drivers via the Krell, and also a full range signal going to your mids/highs. If this is the case, you will need to preserve the passive crossover in your speakers.
In which case the biamp setup is essentally a wasted effort.
Biamping usually is undertaken to bypass/eliminate the crossover from bass to mid/high.
You then need an active crossover.
**Beware-send a full range signal to your mid/highs at your peril!** Use an active crossover!

Yes, you should be able to do that.

However, if the Krells have more gain than the integrated you won't be able to turn the integrated loud enough to match.

Some folks biamp with matching amps. I think using tubes for top end, and SS for bass matches each amp to its strength though.

I'm also biamping, but I'm using a Marchand active crossover between the preamp and amps to split and adjust the signal.

John C.