Another solution here is if yer feeling technically minded then there is the ahem modifying of an image file so thus negating the need for either a scart lead or RGB mod convertor !
Make a AHEM backup copy purely for safety reasons heheh ya need to make either iso or imagefile of yer fave game with CDRWIN/CLONE CD Then get yerself a program like "ZAPPER" or "PAL 4 U" with this you modify the image to convert it to PAL or NTSC as they are universal PAL>NTSC or NTSC>PAL! it scans the image and looks for the areas of code that relate to the vertical /horizontal sync of the code and changes it by patching it when its finished !
Then you re-burn the image onto a cdr!
(Helps here if ya have a mod chip installed or a psx change disk or this is a pointless process!)
Load the game into yer PSX and away ya go! usually this solves a lot of yer PAL/NTSC troubles !!!
Its a bit of a hassle just for the odd game here and there but its another alternative to the scart lead!