Wow yes! I prepared to try the exact same setup! I have 3 williams wobblers so I took one, removed the hook and left it to tie on a fly exactly like you said! Thought of a big bugger, or some bunny strip streamers to give them extra flow would be good choices, but like you said at this time of year it probably won't matter much, just need to get it in front of them. I had heard of people going with a worm behind a spool like this, so I figured a fly should also be a great option back there.
I also picked up a pack of those Wigglefin action discs, which are a small shaped pieces of plastic that vibrate your fly and you can adjust further up or closer to the fly for faster or slower presentations on the vibration. It just sits on a bobber stop so quick to move where you want it.