NIce to have you here, post the link for your board as I know pole vaulting is often a way that ex gymmies go.
Hope you get to indulge your gymnasts here even if not in the gym right now.
I see you live in the Boonies, we are neighbours, that's where I live too, except I am next to a field full of cows in Quebec!
My forum is at PoleVaultPower.com • Index page
I would say that a majority of female pole vaulters have a gymnastics background. Certainly not all, but gymnastics training is something that all of the elite vaulters do. We have a lot of pole vault specific drills that we do on rings/bars/rope. It's also considered important to be able to do things on the strap bar (or a regular bar) like giants, free hips, kips, etc.
Noteworthy former gymnasts that picked up pole vaulting:
Amy Chow - I am sure you all know who she is! She pole vaulted about 13' and did it while she was in med school (which is just craaazy).
AndreÃ© Pickens - NCAA Champion from Alabama. She went over 14' and made it to the Olympic Trials last year. She was my roommate for a few months and is the coolest person EVER
And she has her own bobblehead doll.
Carly Dockendorf - She was an NCAA All-American at the University of Washington in both gymnastics and track and field. What's crazy is she competed during the track and field indoor season which is at the exact same time as the NCAA gymnastics season. Now she is the head gymnastics coach at Seattle Pacific and one of the top Canadian pole vaulters.
Internationally, I think that Svetlana Feofanova was an internationally ranked Russian gymnast back in the 1990s before she switched to pole vault.
World Record holder Yelena Isinbayeva (also Russian) switched to pole vault when she got too tall for gymnastics, I think around age 16 or so.