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Ems has a few choices for boar travel brushes:
Travel Brushes and Accessories
I don't know if this shaving tube would fit your brush or not, but possibly and option:
Shave Brush Tube
Muhle Travel Tube for Shaving Brush [OP-MUH-RV] - West Coast Shaving
I've got a synthetic knot from Golden Nib I think would work well for travel. I just need to mount it in a handle and give it a try. :)
They have a couple synthetic options:
Nylon 23mm [NYLON23MM] - Golden Nib
UK-20mm White Nylon [UK_20mm_NYLON] - Golden Nib
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If your brush stand doesn't quite fit your brush, there was a thread on here not too long ago about how to make your own stand from coat hanger wire.