This idea is almost identical to one I posted a few days ago - ArcGIS Enterprise Add-on for Essentials and Builder subscriptions.
The more I thought about it though, the more I felt that perhaps it were better suited to be a requested enhancement for ArcGIS for Personal Use.
In any case, the ask here is to provide developers who want to learn more about ArcGIS Enterprise on their own dime a cost effective way to do so. Developer subscriptions that include Enterprise start at the ArcGIS Developer Professional subscription, which costs $1,800 per year. For someone doing this on their own dime and who is just trying to get familiar with Enterprise but doesn't currently work for an organization willing to sponsor that subscription - well, $1,800 per year is a lot.
It seems to me that ArcGIS for Personal Use, which is a program targeted for those learning ArcGIS of their own accord would benefit from providing developers with a way to get access to an Enterprise stack so that they could pursue learning the nuances of Enterprise on their own terms (and dime).