Their systems, their rules.
Continue to use a work phone from your employer for work stuff. It’s the much better idea than to
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use a private phone at all for this.
(I know everybody tends to do this, but this doesn’t make it a good idea.) -
use /e/OS for this, as this is begging for trouble when it comes to compliance at the work place.
This is a “degoogled” Android flavour in the so-called “custom ROM” realm. There’s no obligation or business chain of responsibility whatsoever anywhere there to get your work stuff fixed in case it gets refused by IT or if it simply doesn’t work, which given the technical nature of /e/OS can happen at any point in time for any amount of time because of “degoogling” causing compatibility issues with Apps.
Sounds possible, but I have no experience with such a setup.