@billwear Yes.
The trick is to make your Layer 3 switch to DHCP-RELAY all your other VLANs to your PXE VLAN + IP (MAAS IP).
Then you need to add VLANs to the same Fabric you are working on it.
On the new VLANs you created, you need to Relay DHCP to your MAAS-PROVIDED unttaged one.
There is also another trick.
For each VLAN you add and each subnet, you need to make a DYNAMIC reservation.
Once the server boots on PXE on any VLAN, it will forward the PXE request to the proper MAAS server and from there everything is just fine.