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You only need one refractor style diagonal for both scopes and a new visual back for the 10". Astrophysics sells a visual back which screws onto the large Meade rear cell thread giving you a full 2" opening, avoiding vignetting of low power 2" eyepieces. Baader sells a similar device in a clicklock format.
William Optics diagonals only have 40mm clear aperture and will vignette low power 2" eyepieces. GSO diagonals are decent and have a 46mm clear aperture.
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