short person, old bike…dropper?

So I'm riding a Framed bike from the teens. It's old enough to have a front derailleur mount but it still rips and it was the first new bike I bought with my own money so I'm pretty attached. I'm short and it sucks to mount this thing in the powdery conditions we got this winter.

Unfortunately "old" means I need an externally routed 31.6 dropper, and "short" means that dropper would ideally have 100mm travel. Is there any way I can get that without ordering from OneUp and paying international shipping + tariffs?