Do you have any 2" to 1.25" adapters? How about 2" foam pipe insulation?
The 2' to 1.25" adaptor is what jumped into my head also. It should be a direct fit. Also will hold the ep securely so you won't have a nagging what if thought in the back of your head all night. It's easy enough to try. May of the adaptors have a flange on them already, so that will keep it from slipping through.
Another plus is that if you ever no longer need to use them, they can easily be sold off.
I see your post about access to a 3D printer at your local library. Why not print out the number of 2" to 1.25" adaptors you need. Make the 1.25" inside diameter just a touch bigger so you can adhere a piece of felt around it so you have no chance of it scratching your ep barrels.
Just another idea to consider.