Seeking Advice on Designing Efficient Branch Office Infrastructure

Consider a VDI or VDA setup. It could streamline operations and reduce hardware needs significantly.

Honestly, I think you might want to consider getting a professional consultant for this. When you ask, "What are my options?" it usually indicates you need specialized help, and this community might not provide the in-depth insights needed for your situation.

One option could be to explore Entra for device management via Intune, but be aware this will shift you away from traditional on-prem setups. Certain on-prem functionalities like RADIUS and proper PKI can't be entirely replaced under Microsoft licenses, so keep that in mind.

Make sure your offices have adequate LAN and WiFi setups to support all local equipment and user demands. Each location will also need routers or firewalls for connectivity to other resources and a good UPS to protect your assets.

You should really question whether you need ESXi servers at every site. Can business activities effectively proceed without local servers? If the answer is no, you may need to maintain some infrastructure despite wanting to cut it down. Confirming the actual needs through the business team is crucial.