I'm looking for landing net recommendations that the handle will break in sections shorter than 4' but be at least 12' long, netting (must be 75-100 cm or larger, not smaller like 50cm).

I just bought one of these for home use, but I don't see why you couldn't mount a net. It seems to be pretty well made.

https://www.amazon.com/gp/product/B071X7PM2L/ref=oh_aui_detailpage_o03_s00?ie=UTF8&psc=1

This the best I've seen- Stowmaster.

https://www.norsemenoutdoors.com/product/ss94x-tourny-red-permit-cobia-net-94/

most catfishermen use the $50 big one from Academy, but I'm not most catfishermen

I have this one, and it's never let me down.

https://www.norsemenoutdoors.com/product/ts94im-musky-net-94/