Ah blast, I totally forgot about the changeovers. You could still change at Scotstoun but I don’t think that would provide any worthwhile benefits compared to now. I wouldn’t think it’s workable for an en route changeover outside of town as the 43 hasn’t got anywhere that’s practical due to the fact it’s on a main road most of the way. Imagine doing changeovers at somewhere like the westbound lay-by stop at Clermiston Drive, it would be a disaster, or even worse - next to the Cramond Brig.
Unfortunately I think the 43 is just one of these logistically difficult routes to run. It’s run just like an out of Edinburgh bus but it officially does not leave the city. Unless you actually had a depot that was close to Queensferry you’re always going to have high dead mileage expenses on it, whether that’s drivers and/or buses. Newbridge therefore would obviously be best geographically speaking, but that’s the Coach Depot.
It must be annoying though if you live on the CityWEST part of the 43, as you’ll pay £2.80 for a single. Compare that to a similar journey of length and time, such the X6 from Tranent to Edinburgh, where you will only pay £1.80 for a single. It doesn’t seem very fair.