I came up with quite a hack to make it work with playback in Musescore.
I did not want the whole jam part repeat, even though the scores says so. I tried setting repeat count to 1, but then it did not continue to bar 75. I also tried adding D.S. and Segno to bypass that, but that did not work either.
However, it did work when I introduced an extra bar after 74 and put the D.S. before the extra added bar. So I just introduced the D.S. and Segno and made them invisible as can be seen. I also made the bar line invisible after bar 74.
To get the extra repeat in the beginning I had to introduce an extra bar, which I made only 1/64 long. This is short enough to be barely noticed during playback. If you want to make it even less noticeable, you can temporarily raise the tempo there. The reason I added one extra 1/64 before that was to trick Musescore to make page break work as intended.
If you get confused about these measure counts, I can mention that I used "exclude from measure counts" for these three extra bars.