I know this is a bit out of left field but how about a Meade 56mm Plossl. You would probably have to get it from O.S. It will give you just about the widest possible real fov of any eyepiece. I don't really have any idea about its suitability for your scope (I'll leave that to others with much more experience than me). I have an old Unitron 55mm Plossl that I have had for about 40 years and it works very well in my 14" f7.2 dob. I get a whole 1degree with it!!!!!
Here is a sample in the US. A lot cheaper than all the other eyepieces mentioned.
https://www.meade.com/series-4000-su...tml#additional
Good luck in your hunt for a wide field eyepiece.
Michael