Dear Yutaka,
I would be glad to try it out, but only if one of two things are provided:
1) The beta version can be installed IN PARALLEL to the previous, production one.
2) Alternatively, There would be an automated, embedded way to restore the last production version.
In other words, I will, but only if I can switch back and fourth between the two versions with a single push of a button so to speak…
Regards,
Meir