Any set suggestions for a situation like this? The ice isn’t safe to walk on but I can get out to where the scat is. Would a baited conibear bucket work? I can’t remember seeing people use those for otter.

Drop a snare pole down the hole.
Dont forget your crosser so he cant pull it under.

yes a baited bucket works

X2

Baited buckets never worked for me, but I'll admit I gave up on it pretty quick. In my areas there are much more effective ways to take otter.

Both a snare pole or baited bucket may work. BUT, how are you going to get them to the hole? The OP has stated he cannot walk the ice to the hole, only to the scat.

Why not make a pocket set in the snow bank?

Long spruce pole with a 330 wired to it. Take a 8 inch bright colored fishing lure and wire it onto the trigger wires, so the lure faces upstream. Drop it in the open water and wait. I'd drop at least 2 in that hole. A real fish or a salmon head will work.

The rubber swim baits for Muskie that Sportsman's Warehouse sells will work. Giant Rapala lures will work.

If not, chop a couple holes and put in some bottom edge sets. You could put a couple footholds at the toilet, but you better make the set a drowner cable.

Bait two buckets, leave by the toilet, bait them with salmon heads or fresh fish, not old or stinky.

I prefer to sink the buckets under water, not on land. This is my first choice for that hole. Second would be a fish lure on the trigger of a 330.

The otters may be eating a lot of Blackfish, keeping the hole open

Add some tin foil covered rocks to the bucket set that is going under water. Add a fish or two, looks like a big fish or lot's of fish, especially in the dark waters in Alaska. Use a white bucket under the water, deepest hole possible. They will find it for sure. Tie the trap to the bucket and another to the land so you can pull it in to check. Push it out on the ice with a spruce pole, let it drop and wire it off to land. Rocks will take it straight down. Add a couple holes in the bucket at the bottom, for scent and current. Then post the pictures of your otters with the lure in his mouth! Then others will believe too. There's a few ideas, now go get your otters!