Not sure where you live but I use AlphaGraphics in Sunnyvale, CA. They have printed two boards for me 1942 v2 and 1940 on cold rolled steel. It is probably double what vinyl costs. I am sure they can/will print on just about material you want, however.
They do good work and had to learn how to print on steel so they had to print it a few times…they didn’t charge me for that. They even sourced the steel. The owner is Alejandro. Best thing, the whole crew was into the printing. The had me bring sculps to see how they looked on the board and wanted to know how it is played. The front desk person’s (Suzan Pearson firstname.lastname@example.org) was going to boot camp she wanted some pictures. I think the owner’s son is in the Navy or Air Force.
Anyway, they are one potential source and I am sure they would ship and be happy to work with you.
Let me know if any questions…SJ