Free throw violations by both teams, not simultaneous

[CoachJW]

A1 shooting the 2nd of 2 free throws. B1, in a marked lane space, steps into the lane before the shot is released. A1's free throw does not contact the ring. B1's violation was not deemed to be disconcerting to the shooter.

I have posed this question to several officials this year and most say we would shoot the free throw again. Some have said AP, and others have said the A1 violation would put the ball out of bounds to team B, disregarding the B1 violation.

Now the game situation where you might see this. I would like to hear if it would persuade your ruling:

Team A is trailing by 2 points with 1 second on the clock. They are shooting the 2nd of 2 free throws. Therefore, a made free throw puts the ball out of bounds to team B, who would still be ahead by one point. Team A will instead be attempting to miss the free throw, grab the rebound, and score to tie or win the game. However, team B's coach (who has the lead) has instructed a player to step into the lane. A's shooter misses off the rim once, but B1 violated, so we shoot it again. B1 violates again, and A's shooter misses off the rim again. Finally, B1 violates again, and A's shooter throws up an airball.

I first heard of this strategy (from team B's perspective) reading some clinic notes from the late, great Don Meyer, and it got me wondering what would actually happen. Thanks for your help.