4 Microphones in L1 Model ll

Hey Bose Guys,

I am about to make the plunge into a Ll model II with a T-1 tonematch and B2 module. I need four microphones. Having looked through this forum for a bit, I see 4 possible solutions:
1) Use Channel 4/5 as 4th microphone input. may need transformer to go from XLR to 1/4"
2) Get a small mixer and run 4th microphone to that then to 4/5
3) Get a second tonematch T1 and daisychain.
4) Run 4th microphone to analog input on L1

What is the best approach?
Thanks,

Peterf909