With the new version of the SSIS extensions (v3.9), you can set an option to skip the validation of SSIS packages during opening.
I've collected the information in a blog post:
https://workingondata.wordpress.com/2020/08/24/how-to-skip-ssis-package-validation-new-in-ssis-exten...
Have fun and faster SSIS development for you! ;)
Wolfgang
