If you are buying the 1.25" Hotech, I would expect so. I usually have used a 2" barlow, but I do recall using a 1.25" laser successfully in a 3x televue 1.25" barlow. In most cases, just insert the laser collimator into the barlow to adjust the primary mirror after you have done the secondary mirror un-barlowed.
No, the SCA mechanism is dedicated to the laser collimator. Hotech do make one other SCA mechanism as a holder for a DSLR camera.
We may see a version of a self-centring eyepiece holder at some stage - as an adapter. But it would be great if a focusser manufacturer built it into a focusser.
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