Yes, that might work
Might need different names for them than "police" though to still distinguish that difference. Perhaps "deputies" or "volunteer deputies"?
n. pl. dep-u-ties
1. A person appointed or empowered to act for another.
2. An assistant exercising full authority in the absence of his or her superior and equal authority in
emergencies: a deputy to the sheriff.
3. A representative in a legislative body in certain countries.
[dep-yuh-tee] Show IPA noun, plural dep-u-ties.
1.a person appointed or authorized to act as a substitute for another or others.
3.a person appointed or elected as assistant to a public official, serving as successor in the event of a
4.a person representing a constituency in certain legislative bodies.
5.appointed, elected, or serving as an assistant or second-in-command. "