discuss.answer
a simple way could be to create php-config-files.
The name needs to be
components/{yourpackage}/migxconfigs/{nameofyourmigxconfig}.config.inc.php
this is running after reading the config-array and before any processor.
You can do some permission-checks there, modify the config-array or exit with an error-response.
Great! That worked.
Thanks so much for your help again.
I'm glad you got it sorted.
Do you want to post your solution?