Is it possible to use EC2 warm pools?

[mariusfilipowski]

Currently our runners need several minutes to start up (we use ephemeral with AWS features like System Manager agent, KMS encryption based on a custom AMI with many tools installed from the virtual-env project of GitHub).
Pooling is one possibility which we use, but is it possible to improve the startup time of the EC2 instance in general by using https://aws.amazon.com/blogs/compute/scaling-your-applications-faster-with-ec2-auto-scaling-warm-pools/?

[npalm]

We are not using auto scaling, since we create runners based on GH events, the lambda is also responsible for taking the decision to scale. Besides that we generate for eacht instance a fresh registration token, which hopefulluy will be a one time token soon.

In our case our ephemeral images are starting in roughly a minute (linux). Disk are relative small, and not many tools are installed. Besed that we have a small pool, the pool are instances that kept warm based on scheduled trigger.