Now if you really want to add some more inline peripherals I would just run a pump that is hooked up to just those peripherals. Sure you will have more tubes in your tank but I see that as a more feasible way of things working out. This is one of the reasons my new tank is going with a sump setup. Everything will be out of the way and it is quite easy to change things if need be!
Move everything over to a dedicated pump for your UV, heater, venturi...etc, and leave the canister just by itself.