Basically, instead of abandoning that idea completely, I'm wondering about the best way to make these actors only exist on the client (they aren't interactive and don't need collision - they're only visuals), assuming that's possible. When I think about it though, it would be surprising if it didn't already exist as an option in the default properties!
Anyone know if it already exist as an option? I had a quick look in the "Advanced" tab but couldn't find anything promising. If not, will I have to make an actor to spawn them all on the clients as they join the game? Would that even the best way to make them clientside only? Cheers

Edit: Oh DUH, just had a look in the "Networking" tab. What would setting the decoration actors to ROLE_None do?