Re-flashing the logo was always the less likely solution unfortunately.

Region 41 is encrypted in simple terms however that's not the problem, decrypting and re-encrypting is done with relatively trivial XOR.

Unfortunately AFAIK it's not possible to write to and save such info into a rgn41 BIN file and then properly flash the amended re-encrypted BIN to the device. In fact, i don't even know what and where the necessary changes and/or additions are needed to be made in the file. If someone outside of Garmin knows how to do that without proprietary programming kit they're keeping it to themselves, because if it was made public it'd be posted on a forum like this one and others like it very quickly.