The first examples in a new range at Fantasy Printshop are now available in 1:32, featuring RAF and US letters and numbers in a wide variety of sizes and colours:
https://www.fantasyprintshop.co.uk/decals/aircraft-decals/1-no-carrier-film-decals/
While Ray cautions that extra care is required in applying them, I actually found early test examples very straightforward to use - but, of course, you will have to align the individual elements accurately since there's no carrier film to group them together.
Watch out for a sample review very soon.
Please remember, when contacting retailers or manufacturers, to mention that you saw their products highlighted here - on AEROSCALE