Since you’re using Macs (and presumably iPhones) then Apple Business Essentials[1] is worth a look. It’s device management specially targeted for small business, and seems pretty cheap. I think the max is 300 users but don’t quote me on that.
A step up from there is JAMF[2]. They’ve been doing Apple device management for years and companies both huge and small use them. They are probably more expensive than GW, O365, or apple business essentials though.
(No affiliation with any of the companies mentioned above.)
Good luck!
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.