I think your right ,I bought a skidoo 700 sled from a big shop when I lived out west I loaded in on trailer walked in the shop and asked the top mechanic that did all the race sleds and bikes about breakin is smiled and sad pit 12oz of oil in the gas tank for the first tank only (oil injection)
warm it up for 5 mins and run it as hard as you can the harder the better,I did and never had a lick of trouble the 800cc guys that rode my sled all said it was a hotrod for a 700
It's not like these engine are anything special other the the prophub it just a engine if it was made right it will run just fine
I can see a little extra oil for the first run I think it would help carry away any of the material that results from the building process.
and if something wasen't machined correctly running it in some breakin ritual isn't going the magicly correct it.