If the Wessex’s and JPaul’s of the world want to pretend that sedeprivationism is not sedevacantism, or if they want to create some other -ism to describe themselves, it’s all the same to me:
“A rose by any other name would smell as sweet.”
Perhaps, we do not choose to adopt an "ism", as you put it. A Catholic who is not a member of any cult or ill formed association, but a person who has not lost the use of his reason and ability to think critically might better sum things up.
Folks such as yourself, have been captured by myths, and must always find a category into which you can place this or that individual, who has anything to say which does not comport with the sectarian narratives of the past three or four decades.