pick up selection switch

Hello. Can anyone help me? I'd like to rewire my strat copy to allow me to access more pickup combinations. My idea is to wire 5 combinations of the bridge and neck pickups with the normal 5-way switch, and then use a 3-way switch to flip between the neck and the other two pickups. So...

So I'm about to wire up my S670PB with new Dimarzios and I'm adding 2 mini switches for series/split/parallel on the bridge FRED and neck PAF Joe but I'm not sure what I might gain by putting a switch in for the Fast Track 1 in the middle. I mean, it's pretty much voiced like a single anyway...

I'm putting a dimarzio breed set (DP166, ISCV2, DP165) into my RG570. Any need to upgrade the pickup selection switch as well? I asssume on the JEMs the five positions are still just bridge, bridge + middle, middle, neck + middle, neck (with the bridge + middle and neck + middle doing the...