I don't know how much bearing Unleash-X has. Although you have to get it to disable the virtual eeprom otherwise it's impossible to permanently change the console mode and get HD working.
Unleash-X itself will run in HD - once the console has been successfully changed from PAL to NTSC.
Also, there some interesting settings in Unleash-X about multi-region and output format. I'm not sure what these do but read somewhere it might be possible to use them to solve problems with games that screw up on PAL consoles with progressive enabled. I have two of these. I'll try this and let you know what happens.