Differnent types of sims for different purposes
They should introduce a new kind of simulators, smaller, cheaper and easier to maintain, where pilots could train manual flight in their type.
These sims would have room only for the two pilots (trainee and instructor/PM, or two trainees) would disregard or just mockup most of the systems except those needed for manual flight in different conditions and have limited motion (three axis with not much inclination). you would get inside them without the need of a bridge. they would be small like a car. Visual would be not important, just a cheap screen for the final landing, or even nothing.
We would use this sims without having to leave the homebase, because you don't need a sim centre for that. Crews would have to make a reasonable amount of time periodically.
Some of them could be enhanced so that upsets could be trained in them. these would be bigger and would be better placed in sim centers.
And every six months we would do the usual full flight simulator, with LOFT, CRM, LVO, etc... and upset training (one hour per pilot is enough) once a year
I think that would be a good solution for this dilemma