I'm thinking about something similar Rowland.
What mount and imaging lens/scopes are you using?
My understanding is a SSAG/QHY5 attached to a finder-scope (e.g. 9x50) will successfully guide an imaging camera attached to 1000+mm focal length scope. This is when the guider is attached to a computer and doing sub-pixel guiding. Provided the box of tricks attached to the guiders you linked to do the same, I would expect similar results.
DT
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