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+1 for Dave's comments, at short FL (with an OAG) then a QHY5-L2 would be fine. However once you start to get to the 1000mm+ ranges (For example, my RC8) then a lodestar is simply the best. It's all about getting the right imaging scale (arc-sec/pixel), if its too small then you would struggle to get enough light to get stars. On my RC8 at 1600mm I never have pointed the scope anywhere with less than atleast 5 guidestars. This is with a 2sec integration. I would be quite curious to see how well a QHY would do, might borrow my friend's and have a trial.
As a side note one issue I am facing is the different in imaging scale between my guide & imaging camera. My QHY9 has 5.4um pixels vs 8.2um for the lodestar. So unless I have perfect PA, small corrections via the webcam actually show up on my imaging camera. Something small but important to keep in mind in your quest!
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