I have previously used a red dot finder but the (cheap) one I had used a tinted plastic/glass surface on which the dot was projected. The tint reduced the brightness of stars to less than naked eye visibility so it was nearly useless.
A better bet might be a Telerad or Rigel Quickfinder. I believe both are excellent and have two of the latter. Used in conjunction with a normal finderscope they will get you in the ball park and the finderscope can get you the rest of the way if needed. They both seem well regarded.
cheers
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