Two guys have recently stated intentions to convert XK120’s from LHD to RHD. Perhaps you can work out a swap?
Mentioned in this thread: 120 Roadster 672356 Rebuild
Contact: Simon Painter at https://forums.jag-lovers.com/u/Simonpfhc
and Gary Seraphinoff at https://forums.jag-lovers.com/u/AlloyXK120
I believe Phil Dobson has recently finished a conversion: https://forums.jag-lovers.com/u/Phil.Dobson