I don't agree with what MS is doing here, but "I don't like being asked to use a different browser" is going to be a hard sell to your employer if they don't already have Macs as standard.

If they do offer Macs though then I'd say just ask them for one and say you'll be more productive. It shouldn't be a big deal for any reasonable employer, I'm sure they could find a new home for your current device as well.