There is 2 ways for NTSC->PAL conversion
1st – S&W transcoders (i don’t know what you can get…)
2st – software:
2.1 – interpolation
2.2 – speed up – this is only one right way if you have NTSC progressive (23.976) with 3:2 pulldown. You can remove unnecessary fields, after this you can speed up your video (change frame rate) and audio (resample/time-strech)