I pulled the backup alternator off of the engine and then installed the new oil adapter with a new gasket and gasket seal. Here's a picture of the adapter with the vernatherm installed and the new gasket before bolting to the engine.
Then I reinstalled the backup alternator with new lock washers. It was actually a little easier getting to the lower left nut this time. I still had to use the special low profile crow foot wrench to reach it.
The oil filter just barely clears the engine mount tubing, but I think it will be workable. Much easier access than the original installation.
If you are planning to add the B&C backup alternator, I would highly recommend installing the B&C oil adapter BEFORE you install the alternator.