The riding is the same 40 miles each day on mostly flat, mostly good roads, so discs would be overkill.
At the risk of kicking this can of worms around all over again, I do 30 miles a day and both of my road commuters use road BB7’s discs. Not going back to caliper brakes – discs make a lot of sense for dedicated commuter bike where dependability is the key.
One bike uses and old alu Airbourne Carpe Diem, spaced at 132.5mm, so it can stretch to 135mm or compress to 130mm. Been running 135mm disc hubs for years and years and has never been a problem for frame integrity, so don’t rule alu out.
If you went Hope for the hubs, could you change the axle from 130 to 135mm as you change frame?