With UK seeing being of the order of 3 arc secs its traditional to have pixels half that ie 1.5 arc sec across. The main worry I would have would be the vignetting, but if the flats are good and the guiding good then I don’t see it as a serious problem. I use a Celestron RASA and like the images that provides. Used with a Trius 694 it gives good clean results.
The only thing I have heard against hyperstars is the fun and games of collimating them, but for photometry rather that pretty pictures thats not a huge issue.
Do let us see some results…