Hi Peter,
It's not a 1.25->2" adapter, you replace the 1.25" visual back with a 2".
You can get 2" SCT diagonals that screw directly on or click lock 2" visual backs from Baader.
https://www.baader-planetarium.com/en/accessories/adapters-imaging-accessories/baader-2"-clicklock-eyepiece-clamps.html.
Maximum Fov is 1.1 degrees which should pose no issues for your ES82 eyepieces.
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