Not that I know of, I'm afraid you will have to bite the bullet. My local man made a very god job of fabricating and fitting most of a sill to mine this year for less than £200 including the MOT.
I agree - it's probably cheaper to get the welding done than buy skirts, possibly fail the MOT, or have a bigger problem in a year or so...
2003 2.2hdi estate - mine 1998 Volvo 940 auto estate - also mine 2019 Citroen C3 something - the wife's PP2000 user, can help with faults / diagnostics in the Bournemouth area.