from mid-2019, so not very fresh.. but I found idea about

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No worries. I set up an inotifywatch script that transcodes media I write into an ingest folder on-the-fly, preserving the h264 codec but converting AAC to PCM_S24LE embedded audio. It’s automatic, mostly, and it’s quite neat. I don’t mind this part of things.

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potentially interesting for other scenarios.... 

I also found forum post from oct. 2020 about kdenlive and nvenc not working (on dual-gpu system). I followed link there and double-checked visually our  h264_nvenc profile... it look sane... 

also found (probably already referenced) thread about (lack of) 10 bit support in mlt/kdenlive, in context of 8k editing (again, year happened since this was written, so may be some progress already was done) 

also, COMPLETELY offtopic but this article  tries to explain why (Adobe's) After Effects eats so much memory, with some explanation about caching in memory and on-disk: