I don’t know much about the M2 in particular, but yes you should be able to use a single speed on a smart trainer. I took a different path to get there, but I have a dedicated trainer wheel and I have a single cog on there:
Since I’m on a smart trainer and I don’t change gears, it works just fine.
I’ve been riding my fixed on the trainer on and off and it’s been OK, with one proviso. Gearing is important - if the ratio is high then you may not be able to ride at a low enough speed to keep the power low in the valleys. My discussion thread is here:
Right now I’m using the geared bike on the trainer because the fixed trainer gearing needs a different length chain and I can’t be bothered to swap wheel and chain every time I want to ride a TT!
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