Welsh & Irish course contributors, kindly ...
provide a comprehensive, in-house pronunciation guide for your respective courses. Thank you.
While that would be interesting (and Irish did once have its own alphabet) they both work perfectly well with their current systems and have done for a very long time. Were they to change it, replacing signage and computer software and books alongside educating people in a new script or system of diacritics would cost a fortune and not at all be worthwhile. However, I think it should be done :)