I imagine it will be really hard to compete with completely free alternatives like FreeSign[1]. Have you considered giving a free tier, or at least a free trial of sorts so potential subscribers can test the flow?
One nice thing about WSL: GPU "passthrough" (via GPU-PV) is handled out-of-the-box.
There are some solutions (such as https://github.com/jamesstringerparsec/Easy-GPU-PV) that makes the process easy if you are using Hyper-V as the hypervisor, but it is not a straightforward task yet. Hopefully that will change in the future!