It's the way to go but the battle you have to fight is maintaining internal competency to host the infra. Especially if you have any kind of security or regulat

It's the way to go but the battle you have to fight is maintaining internal competency to host the infra. Especially if you have any kind of security or regulatory overlay its going to mean almost full duplication of a giant stack of processes that parallel each other in cloud / on prem. I think the key as you have outlined is to break out the simple batch compute and CPU/memory intensive or data volume heavy tasks as these are what generate the cloud bills. In general these aren't the focus of your policy constraints, especially if you can claim the data is not "at rest" within these systems.