New AVD environment on 25. address space

We currently have a number of AVD environments on 10. address ranges.  We have a new requirement for a 25. address range.  Initial thoughts are as follows:

- Standing up new VNET with a 25. subnet

- New Host Pool, DAG, etc

- New Subnet on the AADDS VNET with a 25. address range 

- DNS configuration on AADDS so Session Host VM's can resolve. 

- Traffic will route out from an Azure Hub Firewall over express route

Are there any glaring holes with this approach?

Thanks in advance.