Sharing Box Office Staff within a regional community

We're working with a lean Box Office staff (thank you COVID) and find that we are feeling extremely understaffed during show and are feeling at least close to adequately staffed between runs. Of course building budget for additional full-time or part-time staffers takes time to make a case for, but we have a vibrant regional community of arts orgs here in Houston and many Tessitura users. At a recent regional meetup the idea was pitched of creating a shared database of people who work or have worked in your box office and already have basic tessitura training who might want to pick up the occasional shift working a window. This would allow us to stagger our full-time staff to regular box office hours, making them available to wrangle subscriber pre-sales, etc that frequently need to overlap with show runs. 

Someone in our group suggested posting here and seeing if any other community has created something like this and if there are any lessons learned or best practices you might want to share out.

Thanks for your help!

Bridget