You are a difficult bugger! lol
Right, most of the "carp" nets are single piece 6 foot handles with 42" arms, HOWEVER, there are "stalking versions out there. Trouble is, they tend to be two piece, so 36" in section, plus the actual arms themselves, also 36".
If this can somehow be squeezed into your luggage than the only one to go for that's worth having is the Chris Brown Products Stalker Traveller (3'x2) Think the Sandy Nielson of landing nets and metal wear
http://www.cbproducts.co.uk/product/36-big-tench-and-carp-stalker-landing-net/The other more likely option is to get a telescopic handle and a threaded net head.
Korum do a "folding" pan and triangular net heads as well as a Specimen 32" net head.
https://www.korum.co.uk/products/nets-and-handlesDrennan do a lovely 32" net
https://www.tackleuk.co.uk/Shop/CoarseFishingLandingNets/Drennan-Specialist-Landing-Nets.htmDaiwa do a tiny telescopic handle, but its not cheap!
https://www.anglingdirect.co.uk/daiwa-mobile-landing-net-handle-5-90mLots of telescopics out there, but they all tend to be a meter in length when closed.
On the handle front, it would be possible to cut a 6 foot handle into 4 and "spigot it", but that's not going to be easy.
I shall have a wee think of where I have seen multi-piece handles...
