Thanks Requimatic, I snipped your list of things I had tried before I even started listing what I thought was so important for the developer to notice. I do not use the Geforce Experience app for any purpose and my physx driver install is handled separately cleared with the driver cleaner sourced from guru3d. I guess I assumed this was obvious but I should have been more through. During a clean install I am wiping all traces of the nvidia drivers using the same driver cleaner.
I'd like to think that I handled every possible issue but the fact that ONLY Valheim H&H is affected and ONLY after the H&H update I'm not inclined to see this as an external issue.