@SHOTO
There is nothing that would prevent you from doing it, and it would very likely work.
You never mentioned your Inet bandwidth, or if you have multiple "local lan segments" or Vlans.
In a "Router on a Stick" solution , both Inet upstrean & downstream, and local inter lan/vlan traffic has to pass through the same IF (and IF bandwidth).
If you use your NUC/pfSense as the "only" router in your setup, aka. also serving/routing all the inside Vlans. There are some things to be aware of.
If you just use the NUC/pfSense as the "Internet gateway w. some additional VPN stuff", i'd say try it out. (Aka. still using the Netgear to serve the local lan/vlans)
If you just have a single lan on the inside, all your local traffic would be "switched" and never pass the NUC .. Go for it.
But
In a multi lan/vlan, all traffic has to pass the L3 device (pfSense), in order to traverse from one lan/vlan to another. Aka traffic would also have to pass the "single interface" twice (up & down).
The big hurdle here is the NUC IF bandwidth ...
If it's 10Gb go for it.
If it's 1GB ... It depends .....
/Bingo