BudsGunShop.com - Accepts a glock brace.

yes it will work with braces designed for the large frame Glocks

Bradley, yes Sir the G41 will work with a Folding Brace Since the Glock 41 has the same hand grip as the G20/G21/G40. --- https://zahal.org/product/recover-tactical-20-21-brace-stabilizer-conversion-kit-for-glock-g20-g21-2/

Flux deffense works with g41 also.
fluxdefense.com/shop/flux-heavy-10mm45

Yes, there are several companies that make folding braces for the Glock 41.
You just need to make sure you get one that says "large frame glock compatible" and list the G41 as a compatible model like this one.
recovertactical.com/product/recover-tactical-20-21-stabilizer-kit-for-10mm-45acp-large-frame-glocks-bundle/