Potential problem with the empty templates...
While the game will generate a NPC to be the 'hobby' head, and the lots are in the game, the game makes a NPC a member of that club.
In riverblossom where I did some testing (since Rose is most likely always going to be nature enthusastic), I put her into the lot, where the head, and two NPCs showed up. A pizza delivery man, and an exterminator.
I doubt this is a problem with the empty templates. I noticed the very same thing even without them. Several NPCs showed up as club members, such as the burglar, some custom dormies, some professors and even the cook from Downtown. I have very few townies in my game - maybe five "real" townies and about eight dormies? The rest are all playables, maybe that's why the game even allows NPCs to wander around the club lots? *wonders*
I haven't even installed the clean hood and I had a burgler, mailman and a professor show up as members. And...this was before I put any hacks in for testing. Hmm... I'm gonna install this anyway as I really, really want a clean hood.
*remembers to backup first. not wanting firey balls...he, he*