I won't speak for Brock but what I'd do is use score as proxy for leverage. Tie game being the highest, +1 next, -1, next, and so on.
With a "lineup" for each score. Pressly and Rogers are #1 and 2 respectively in a tie or +1 score. Double barreled warm up with whoever matches up to batter handedness entering first. This is assuming the opponent is a conventional L-R-L-R lineup and not heavily platooned against the starter. In that event keep the opposite handed guy on the bench obviously.
In a +/- 3 run game, ie. low leverage, the lineup would be virtually flip flopped. With Belisle or Tonkin first out of the gate.
Basically, pitch to the score.