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A combination of your two existing focal extenders and one decent 1.25" EP between 24mm and 32mm (plus an adaptor for the 2" barlow) may actually get you close enough to everything mentioned in this thread so far. If that was my approach, I'd go for low glass (Abbe or Plossl), but that's just me and other designs will probably work just as well.
A concern may be what powers your seeing usually supports.
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