does anyone know if i can change the bcm module without having to recode it.
thanks

Yes AFAIK.

Have a look at this chaps vids IIRC I've seen him do it (not necessarily to a VW) or I'd expect there will be other vids on the internet of varying quality of information and presentation. - https://www.youtube.com/@mrautoservices7354

HTH. Good luck.