I can't see how this approach really work. If you have some bid for 5-5, your gain by showing them immediately, which is not the case when you mix them up in a 1NT bid. Why not play something like 1NT majors or minor, 54+ but not 55 minors 2C one minor 2D/H/S/NT as before 3C 5+H and 5+minor 3D 5+S and 5+C 3H 5+S and 5+D 3S 55minors at least you shows your 5-5 suit before the possible interference, and 1NT is less vulnerable since usually p know the specific suit you have if opponents preempt.