If I understand your question correctly, the hose routing you're considering is one of the feasible options and Lamar Hires has a youtube video that explains it. In particular, they (Dive Rite) sell an adapter called BC hose quick disconnect that facilitates over the shoulder routing (you can find it at divegearexpress including video). I dive mainly in an SMS100, drysuit in cold midwest waters. Initially I kept the inflator in the default configuration since I was diving mainly in open water and wreck penetration is modest. I got the adapter and it helps with connect/disconnect.
As a side note, I had implemented my own versions of Edd's mods except for keeping the inflator in the default left shoulder configuration. However, I ended up moving it to the left bottom for four reasons: one, with drysuit and thick gloves, the bottom dump valve had a tendency to play hide and seek, so did not get used much (not an ideal situation in horizontal trim); two, in the SMS100 with the inflator is attached to the shoulder, the hose ends up supporting some of the cylinder weight when donned on the surface (when there's a swell/current, it's more tricky to don the tanks under water in open water); this is I think SMS100 specific; three, over the shoulder hose routing, even with the special adapter, creates clutter just by virtue of the longer hose; as victorzamora mentioned getting the right hose length is not easy (have a bunch of them in the closet); four, it is more of an entanglement hazard when entering wrecks. After the switch I can use both the inflator and shoulder dump to dump air in horizontal trim, and when I inflate the BC's wing, air enters into the bottom area directly (without diffusion from the shoulder area in the default configuration) which is where it's most needed to better align center of gravity and buoyancy; the upper part of the SMS100 has been significantly constricted to induce this imbalance (one of Edd's mods) which in the SMS75 is built into the wing/BC design. Among other things.
As a side note, I had implemented my own versions of Edd's mods except for keeping the inflator in the default left shoulder configuration. However, I ended up moving it to the left bottom for four reasons: one, with drysuit and thick gloves, the bottom dump valve had a tendency to play hide and seek, so did not get used much (not an ideal situation in horizontal trim); two, in the SMS100 with the inflator is attached to the shoulder, the hose ends up supporting some of the cylinder weight when donned on the surface (when there's a swell/current, it's more tricky to don the tanks under water in open water); this is I think SMS100 specific; three, over the shoulder hose routing, even with the special adapter, creates clutter just by virtue of the longer hose; as victorzamora mentioned getting the right hose length is not easy (have a bunch of them in the closet); four, it is more of an entanglement hazard when entering wrecks. After the switch I can use both the inflator and shoulder dump to dump air in horizontal trim, and when I inflate the BC's wing, air enters into the bottom area directly (without diffusion from the shoulder area in the default configuration) which is where it's most needed to better align center of gravity and buoyancy; the upper part of the SMS100 has been significantly constricted to induce this imbalance (one of Edd's mods) which in the SMS75 is built into the wing/BC design. Among other things.