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You could start with a dev tenant so you could have a test e5 license.
https://developer.microsoft.com/en-us/microsoft-365/dev-program
you could configure the tenant and with it you could enroll a virtual machine with autopilot so you could test it almost for free?
Is the M365 E3 sandbox environment time bound, i.e., does it expire after a set amount of time or period of inactivity?