Just get an attenuator for one channel . this can be a fixed value or variable and insert it between the preamp and amp on the side you do not have hearing loss. A balance control.
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If you want to pursue the two preamp mode, I don't think it will be problematic. But the best way to do it it my opinion would be to invert the outputs on both and make them a truly balanced configuration. To do this you would simply need to make a set of "Y" cables with RCAs on one end and a female XLR on the other. Combine the two grounds on pin one of the XLR and on pin two one of the positives and pin three the other positive. This is of course only going to work if you have a balanced amp. Sounds like a fun project.
Thanks for the advice all, and I think I will try a 3dB attenuator first like you said Stanwal to see if that works. This is obviously cheaper than getting two, and it might just work. Rwwear, unfortunately, my M60s are not balanced, so the XLRs are not possible, but that does sound like an idea, and now I know how to if I ever end up w/balanced amps.