Yeah. Of the ones I distinctly remember, I recall some reddit posts by Greg Maxwell back during the segwit activation days, which I cannot find because because reddit search sucks and I neglected to favorite them at the time. So they might be lost to history. But Greg was discussing how miners could run some soft fork software next to Bitcoin Core, and it would use the soft fork software to validate incoming blocks, and use Bitcoin Core to validate outgoing blocks (to ensure that the blocks would be accepted by non-upgraded miners).

More recently, there was related discussion prompted by the CTV activation debate in 2021. That might be easier to find, and more diverse discussion since many people took part in it. Jeremy had proposed using an alt-client to activate CTV, which was controversial in and of itself, aside from the proposed Speedy Trial activation mechanism.