Yeah, these are worth exactly as much as they weigh in fractions of a short tonne.
Take this as a learning experience, and accept that al least for now, you may be in the position to afford your own Linux capable machine for personal use.
This may actually help you in the sometimes difficult task of maintaining a durable firewall between 'personal' and 'work' digital worlds. If your work machine is not even an OS you would use for personal projects, this can keep your personal productivity from creeping into the machine which is co-owned by work and their MDM vendor.
Later, when you have your own 'unicorn' idea, work won't have any claim on it being a product of employment, and the time tracking that comes with MDM can be your fortress of proof. All of your compensated time can be accounted for with the work done on the machine they own and none of your pet project will be in that time or equipment.
Also, if || when the (new) management approach reaches it's 'halt and catch fire' stage, you wont find your personal digital assets suddenly locked behind a user:pass that no longer function.
Companies just want an excuse to layoff people. Don't give one to them.
Just use whatever machine they give you and buy yourself a new Linux machine.
Compliance, however, is annoying (and mostly bullshit), but it's required for signing massive contracts. So unless you can work within their compliance systems (I.e figure out which auditor/platform they're using), your argument about "my manager said" is gonna fall on deaf ears.
:(