Well, yes and no. Since I did it in the forumhome_start hook, it needed those pre-registered for my new template. As long as the variables are good at that hook, then it will work the way I did it.
The forumhome doesn't care about the old template as long as I pre-register everything for my new template. Doing it in the parse_templates hook might be why it didn't work for you with your code. You would have to check whether whatever variables you are pre-registering have already been validated at whatever hook you are using.
Now I'm getting confused. And it hurts! LOL
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