Props to the OP (and those who tweaked), this is a game-breaking tactic.
Playing with Wrexham, I've won consecutive promotions from Vanarama National and League 2, losing 2 matches in each season and shattering records for points and goals scored. I tweaked a little myself, taking off the individual instructions to tackle hard, and playing the central BPD as cover. The defense has generally been very strong. I play the attacking CM as a mezz, just because that suited the player I had there. I imagine you could play whatever roles you wanted for that midfield two, so long as one is support and one attack. Perhaps even two support duties would work.
It's a fun tactic if you want to focus on stuff like youth development, scouting, building a strong coaching team, and dealing with the board without having to worry about messing around with tactics all the time.
Question for the forum: like others, I've had the problem where the central of the three strikers doesn't play as well as the right and left-sided AFs. I know there are tweaks playing him as DLF or F9. Have people had success with this?