Any R53 posts on here are diluted in the host of other model related stuff.
Best bet, get yourself onto the R53 Owners Club on Facebook. 5,865 members and counting, all with R53s. https://www.facebook.com/groups/154538898666141/
There is a guy on there, Haywood Warwick, who is a genius with maps and he can do exactly what you are after sending a suitable, bespoke map for you to upload.
Just about to get him to do mine.