Isn't imagine just a limited time use. And is the insider a permanent license too?
Imagine is a student entitlement.
The Insider program is for as long as MS wants to support it, but absolutely NOT meant for a production environment.
And accepting of whatever updates MS wants to push to your system, even if it breaks something.
But you can run multiple VM's in a regular Windows OS. I do on my Win 10 Pro.
3, 4, 5 VMs simultaneously. Just need sufficient RAM.
4 x VMs in VirtualBox, and the host Win 10 Pro.