Corsair Thanks for that. yes I can use the ASIAIR for guiding with my R6M3 using an intervalometer, but that's with it set with no camera as you can't select something it can't see. There are a few tricks to use my guide camera temporarily as a main camera, but it's all a bit fiddly.
I should have spent more time looking into whether my Canon was supported before buying the ASIAIR, but having seen the apparent length of time it is taking to add support for other cameras I no longer hold out hope for mine in the short/medium term,
Based on that I'm going to go with a mini-PC with NINA/PHD2 etc. From a ZWO perspective that means that when I do buy a new camera I will now no longer need to look at ZWO (same for accessories) - I would have happy to have done that to stay in the ZWO eco-system, but as I'm going to be using my Canon for a while yet I need to do something else.
Anyway - many thanks for your suggestions.