There should be a feature where you could give permission to a friend/tester to change the pattern as needed. Or if you wanted to do a collaboration pattern you could have multiple people work on the same pattern. Here’s how it would work.
Choose your testers
If you have a tester that you can trust you can give them permission to edit the pattern as needed
OR
See if anyone wants to collaborate on a pattern
When you find someone/s one of you make a pattern draft and share it with the people/s
Work on the pattern as normal
There may be some flaws in this but I think it would help with pattern testing the most.
There already is a feature for someone you trust to edit your patterns (however they will be editors for all your patterns) here is a screenshot, if you’ll like to know more about this feature you can check the help center and search editor
No worries! Glad we offered some help , also in case I forgot to mention it make sure whoever you choose you trust as they get access to all patterns not just one