My first thought is your company may have grown beyond the point where Mac’s have clear advantages.
I mean when someone asks me which computer should I buy, I say a Mac because it is quantity one.
But at fleet scale? Something like Dell because of support, product line breadth, and a B2B ethos…I mean Dell has technicians who will come on site and fix your gear.
And your employees gear.
Companies like Dell have staff that helps companies meet compliance targets. They have relationships with specialized consultants who solve business problems.
They work with small businesses. Apple doesn’t do that because it’s business model is different. That might be why you feel like inventing your own wheel is the way forward.
Because the current friction is only likely to increase and the solutions are not a core competency of your business, my advice is to find a consultant who solves these problems for a living.
This is a cost center not a profit center.
Good luck.