not sure if this product is available to you over there, but the Feedback Sports Omnium trainer is designed to travel.

if traveling to an event, perhaps the promoter or sponsoring shop has one to rent?

Hotels near major events would be well to have trainers on hand imho...

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Anne Barnes
ABBikefit, Ltd
FIST/SICI/FIST DOWN DEEP
X/Y Coordinator
abbikefit@gmail.com

Don't want to spend anymore $$$!

I'm going for a long trip so I'll need it with me even after the event

They can be absolute bastards about stuff like this. Sports equipment v's luggage

If you can live without it for 2-3 days around your flights i would use luggage mule