1. You are correct that the audio going to the exciter will need to be disconnected from the IDA controller, else you'll load down both audio signals. I have observed this.
2. I sought to temporarily, while using the NHRC, disable the "COS" (CAS or RUS) rather than the PTT. I still have not solved this problem, mostly because I've not had time to put in the effort to do so. I think your idea of disabling the PTT may well be an easier way to meet the need - being able to disable the repeater whilst using an external controller.
Don't think that you are over-engineering this. It seems to me that preserving this repeater as closely as you can to its original configuration has benefits.
Good luck with this and feel free to contact me directly if you need to. In fact, Keep me posted. I've posted this very question here before and not gotten any response. You and I may be pioneering this.
By the way, did you see my post from earlier today?
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