Those are quite expensive hence I have not explored that option yet. Another reason is exactly what you are afraid of, the room or absence of it. The GPU itself is impinging on one of SATA ports and I had to get a bent SATA connector to just make it work.
I will open the case and visually check again.
Yes, buying a brand new AM4 setup would be a dead end choice. Because I already have these AM4 things, I wanted to just upgrade.
Will changing the CPU cause me to lose my Windows license? I use only local account. And end of road for Win 10 is also another reason to choose a new CPU.