No, the subscription is pretty much a fact of life for software other than some of the entry level options. For many packages you either pay a subscription, license fee, or maintenance fee. You can skip paying maintenance fees, but when you finally want to upgrade you usually end up paying for that.
This is a important decision and you need to demo the software and have the providers give you a web demo showing the steps to create the CAD model of your typical parts, and the steps to create the machine code. They all do that. You will need make sure they can make the revisions to the post processor if you need that for your machine.
I found a video of what I think is close to your machine milling a part that has some similarities to what you have described. You need to be explain the boring head to the software providers in detail so they can demonstrate how they will deal with that. Personally, I would want to look closely at how it simulates the milling steps. Re-building the spindle or boring head is very expensive.
https://www.youtube.com/watch?v=IAQ0pfBHrlY
I really should not say anything against Fusion given my lack of experience with it. My main issue is Autodesk. I know many use it, but I expect the vast majority are driven to it because of cost. I pasted a link to a CAM survey. I suggest you look at that. Only a small percentage of those surveyed were router users, and I expect a lot are hobbyists. It might give you some other names to look at.
https://www.cnccookbook.com/cnccookbook-2020-cam-survey-whats-the-most-popu
lar-cam/
You might want to look into Alphacam.