Could I play around with it by installing in qemu and if I like that, take my configuration.nix from qemu and install it as my main OS?
Absolutely. That's how I got started ;)
If you install Nix (the package manager) on your current system, you can actually directly build a vm from a config file via nixos-rebuild build-vm
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With those requirement, the first question you should ask yourself is whether you really want e in your bike at all.
What are the reasons you want an electric bike over an acoustic one?
Next is what you're going to be using it for. You said it was for the daily commute. A commute can be anything from a 5min ride through a quiet neighbourhood to a 1h ride through the forest and countryside.
Distance, terrain, traffic etc. make a difference on what kind of bake suits your best. How does (or will) your commute look like?