Hell one of the law firms I worked for gave us work phones specifically so that if we got subpoenaed, we could hand over the work phone and be certain there was no personal data. And on the flip side it was easy to say no work material was on a personal device. In my experience, most of my friends that work at firms have two phones or use Samsung specifically for their secure folder feature.

It really should not be a big deal to have a totally separate work phone, especially when it's the government and anything done on it should be archived anyway