Hi Oddologist!
Have you followed step by step the instructions posted above? The "Play - Performance - Rewire - Tempo Track" setting in Sibelius is specially important, along with record-arming the track where you´ve put the rewire fx in Reaper (don´t put anything else in that track, and just in case disable also media buffering). Re-check the instructions above and if you want, try the latest v5 pre to see if it helps - a couple of sync issues have been enhanced -.
Whenever Sibelius opens badly, close it and try turning offline/online the rewire fx in Reaper, after that see what happens.
Drum clefs are a limitation inherent to Sibelius; you can even read in their forum about that. I think there was a plugin to deal with that, but anyway I never paid much attention since the kind of work I do with drums certainly requires common staves for a proper playback.
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