I forgot to mention the ever-useful Debian Goodies:
https://packages.debian.org/stretch/debian-goodies
As well as zsh with ohmyzsh and Powerlevel10k... Gives the terminal autocorrect, word suggestions and much more.
You could create a partition that is small and install on that. Testing the Alpha, I did on a 60gig partition. I had another at 30gigs.
Your primary reason for testing won't necessarily be to Test it for the devs, but to test it for you. You do not have to buy Ultimate and Pop_OS! is a solid working OS.
But I would still encourage you to test it anyway- for your own speeds. Zorin OS16 Beta is as fast on my machine as Alpha was, which admittedly surprised me. I really thought it would be slowed down.
I am unable to wait a couple months for Zorin Lite, so will be doing some modifications of my own on Zorin Core. As it is, I have been waiting on Z16 before really progressing on my webpage and themes and can wait no longer.