The only mention I'm aware of is with who has the backcourt count (trail), and then in another section it tells us who the R is on the opening tip. Any deviation from that would need to be pregamed and agreed by all the officials, but I'm not aware of any official mechanic that allows for it.
I see nothing wrong with the R taking the count while the C stays back to cover the matchup until R can take it over.
Alternatively, they could pregame that the U2 would simply take the count and move into R. U1 would have to recognize and adjust.
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