You are correct, if you conform the 24P drum shots to 25 they will no longer sync throughout the 5 mins or so. So yes it will mean a certain amount of repositioning shot by shot. As long as they are not too long you should be able to reasonably get them to look in sync but obviously they will be a frame out every second.
Changing 24 to 25 in Cinema tools will be perfect in terms of not giving any motion artifacts but the length will change. You could try speeding up the clip by 4% but this may introduce some slight "jerkiness" to the shot.
The problem with changing the framerate but keeping the duration is that something has to give in terms of a frame of 24 needing to be .96 of a frame of 25. So you often end up with some kind of repeat/interpolation/frame rate artifact that makes the motion slightly un-smooth.
Hardware standards conversion would do a good job but not going to be easy/cheap.
In terms of quality overall you are probably going to get the best result by biting the bullet and re syncing/retiming the drum shots.
You are right, sadly you were always going to hit this issue given that one camera was 24 and one 25.
best wishes
Neil
http://www.patience.tv
