I liked working with Propress and PEX, but saw failures would make me shy away and do the extra work. (and I like metal, not a fan of plastic in genral)
I've used black iron fittings for mounting; never copper that I recall.
For glueing rod into a flange, I'd cross drill the rod dia. once pack it with adheasive, then pack the flange and insert rod. With epoxy, esp. JB Weld etc. the glue will form a shear pin of sorts in the rod holding that, while the flange threads hold that side.
I'm not sure if you could manage threading rod with a pipe threader or not. I think it might be prone to crack vs machine cut unless the cut was quite shallow.
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