Hello folks, because I love to reply to my own threads - and because I am just now getting around to moving this VLAN 10+ months later, I decided I would drop a few lines for future readers on how it went down.
Using Brandon's suggestion, I threw in a new VRRP and gave it an IP address. And that was all there really was to it. Easy!
Here is what the config looked like ...
create vlan "Radiology" tag 172
configure vlan Radiology add ports 48 tagged
configure vlan Radiology ipaddress 172.21.114.1 255.255.255.0
enable ipforwarding vlan Radiology
enable bootprelay vlan Radiology
create vrrp vlan 172 vrid 1
configure vrrp vlan 172 vrid 1 add 172.21.114.201
enable vrrp vlan 172 vrid 1
In this example - I gave a VLAN called "Radiology" and it has a VLAN tag of 172. The actual gateway IP (aka the VLAN IP) ends in .1, but .201 is what some devices were randomly configured to use.
Thanks again Brandon!