Would sanded kapton perhaps work? I've had great success with (swirled w/400grit) sticking to kapton with a variety of filament types, and it's my 'go to' bed surface. It's defintately not shiny like bare kapton (or raw aluminium).

I'm considering using the IR sensor for the machine i'm currently building which will have a Mic6 aluminium build plate. Do you think this might work for your situation, since anodizing it seems like it's too risky.

FWIW, The kapton is crazy durable when used this way. I've have close to 100 prints on the first application of it…