This "Ultra low eyepiece adapter" from Astrosystems should work. I expect it is cheaper than the Televue and it would seem to provide more in-travel.
https://www.astrosystems.biz/eyepieceadapter.htm
I've just ordered two for the same reason - just put a 45 deg 2" erecting image diagonal on a refractor and I have the same problem. These plus 1.25" eyepieces should sort the problem.
I already have one somewhere in my stuff but cannot find it
