Using VBA to change Outlook default meeting length times

Can I use VBA in order to change the default meeting lengths in Outlook 365?

Currently, they are pinned to 30, 60, 90, 120 minutes.

We’d like to pin them to 25, 55, 85, 115 minutes; or perhaps 25, 50, 75, 100 minutes.

Is this doable, or are we stuck with having to calculate the times out in our heads and manually overriding the times?

This would need to be shareable between all staffers in our division but not necessarily everyone in our organization that has an Outlook account, because this initiative is division-wide, not organization-wide. Most of the staff affected by this would be non-programmers.