compression work around that saves time?

I'm compressing short videos that I will import into a DVDSP project. I outputted the videos as HighRes 422 HQ from FCP.

In an an earlier test run of the DVD project I accidentally outputted only the mpeg video, and not the audio. In order to avoid going back into Compressor and outputting again, I tried importing the HighRes video into DVDSP so that I could use the audio track.

I used mpeg video from the Compressor output and audio from the HighRes FCP output. Put both on same track. I burned the DVD and it totally worked! Was able to play the resulting DVD using my macbook and the random TV dvd player we have at our office.

Now, I am compressing all 6 videos that ultimately need to go onto the DVD. And, it's taking a very, very long time on my very old macbookpro.

Question: does anybody have experience with the work-around I happened upon? Will I get myself into unanticipated problems if I do this with all my videos in order to save time?

BTW - thanks for the forum. First time asking a question, but that test DVD was the first one ever with DVDSP. Only able to produce it because of all the amazing information I was able to google whenever I got stuck - over, and over, and over again.

Andrea