I figure you're doing this already anyway, but wanted to double check...
It appears that your main source material is the PAL DVD release. Please make sure that any material that isn't already sourced as PAL (additional music, dialog, sound effects) are correctly pitched up (~4.2% as you know) for your PAL release. This will ensure that the NTSC release will sound exactly like it should once you encode that version. A lot of people here in NTSC-land don't notice much difference from the the PAL speedup, but those like myself hear a huge difference. And it may sound especially odd if some of the additional music gets pitched down on the NTSC encode if not properly adjusted the first time around.
Again, you've probably already taken this into consideration, but I thought I'd throw in my own 2 cents.
savage