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I've had a few more questions, some quick answers:
Q: What pieces did you use on the camera/eyepiece end to hold the BF?
The easiest way to do this is to use a celestron 1.25" diagonal. The blocking filter unscrews from the 'black box' and is the same thread as the Celestron eyepiece holder part of the diagonal. Unscrew the celestron eyepiece holder and screw the Blocking Filter/Eyepiece holder from the PST onto the Celestron diagonal.
Q: Any quick tips on imaging with a QHY5 or similar mono camera? e.g. will I need a barlow?
With the standard PST (the model I had anyway) the eyepiece holder was in two pieces, one piece was an empty (small) extension tube the same size as the eyepiece holder that included the BF.
For images I had to unscrew the eyepiece holder and extension tube, remove the empty extension tube and screw the eyepiece holder straight into the PST black box.
For the modified PST with the GSO focuser, I had to add an extension tube to bring it to focus. I used a barlow with the lens removed from and it just got me there.
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