I'm going to second the comment to leave well enough alone. Do NOT mess with your machine if its what makes you money.
I know you commented you don't have funds for a second computer to test with but that really is the best step for you.
This is especially regarding some of your other details. You are not in for a quick and smooth transition (sorry to say).
VSTs are "sort of" supported on Linux. Basically they're not and there are work arounds that I haven't done using wine for compatibility.
I run a virtual machine for the windows software I am reliant on. So basically my Photoshop etc I use Affinity in a windows VM and it works fine. Depending if you get intensive with your work you might need a lot of resources or experience lag. But for the most part it should be fine. Look into virt-manager for your VM if you want to go that route.
Besides the VST issue, audio recording will probably give you additiinal problems. I haven't delved into it because he rabbit hole went too deep for me, but from what I've read there tends to be issues with audio in VMs (tremendous lag for one).
But all that being said, there should be a solution for all of your needs. It probably won't be straight forward though given your use cases. I don't want to sound negative with my warnings, I just want to make sure you don't shoot yourself in the foot with your work.