have you gotten an answer on this yet?
I think your question is a little confusing to me.
if your License server is ONLY your license server, then you can change it on the farm Settings
Right click the Farm in the Access Mgmt Console/Delivery Services console, and choose properties. And in there is an option for License Server. You can enter your license server info here.
**Note – You can overwrite this setting per server by not taking the farm settings and setting it per server. So you may want to right click on each server, go to properties, and check the license server area there. if it’s showing the wrong server name, Check the box that says ‘Use Farm Settings’ and it will pass down the information from the farm for the license server.
if you’re issue with the PNAgent not keeping the the server path listed in there, then that’s something different…unless your old lic server was also hosting your PNAgent settings.