Well basically your spot on, made a few calls and cant move or adjust anchor points. No chance of getting them put ontop of rear drawers either, no matter how good i make them.
Cant use a extension strap either as anchor point is still under the drawer system.
As for the C.R.A.B bar, thats another option which prices have dropped on, but still $380.
Being my drawer system is too high and i cant even fit a pram properly into the back i have too modify it anyway so i will probably make a new set with access too the child anchor points. The extra gap between seats and drawer system i will add a water tank and fill it with something else.
Then finish it off with a cargo barrier