A cheaper option would be to get modified or try modifying yourself your Canon 80D.
Its a late model Canon and there is a lot of performance to be extracted out of it.
Access to dark skies helps of course.
Modifying the camera locally may only cost $400 or less.
My EOS R is currently being modified overseas replacing the low pass filter with a Ha friendly one like used in the EOS Ra model.
With custom white balance (you can do this easily yourself) the camera should be OK for normal use as well.
Greg.
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