Didn't the 2017 rule change make those interstitial channels shared? So GMRS can use them but they may find FRS users there, too. Previously GMRS had no 467 MHz simplex allocation, but by splitting the repeater inputs and using 12.5KHz bandwidth they do at 1/2 watt, just like an FRS user.Under the new rules gmrs cannot talk to FRS for new radios. I’d stick to high power channels or buy a separate FRS handheld.
Now why the FCC would allocate a shared channel using the same power and bandwidth and not expect a user to talk across services I couldn't say.