I have an Hitachi CML155XW 15 Inch LCD (2002). Does 15k and 31K In Pal. (Won't do 21) Works fine whether I choose PAL or NTSC from the boot menu. (Plugged into the A1200 thru the silver commodore VGA adaptor)
If you can find one on ebay or the wide world. They were used by corporates quite often. I got mine in an ex-lease auction.
PS: Don't believe the specs at the Hitachi Web Site. It works.