What if...

[jicecone]

I think you mean 7-3-5 Penalty.

B1 causes the interference however, because B1 is already out then the umpire can also call out the runner being played on if the umpire judges a possible double play.

R1 just ends up being called out for the batters interference. R1 has not comitted any infraction but the batter has, and he has struck out also..

Question: Is there a scenario of this sitch where the R1 would not be called out for the interference?

For the batters inteference? Only if the umpires judges that a double play was not possible. Eg. Batter strikes out and crosses in front of catcher. Catcher goes to take the ball out of his glove to throw and drops the ball.