Tricky problem… The diagonal is 1900 mm overall length, which is tight. My first thoughts are (1) that taking the front wheel off might be OK, but removing the forks and reinstalling for use on a standard bike is probably too big a job, and that (2) a 125 is not useable on motorways (particularly two up) unless traffic is sparse.
Scooters tend to have shorter overall length because of smaller wheels. Surfing the net I came across this brochure from a Taiwanese manufacturer that I’ve never heard of…. But regardless the overall length of the 150 cc model is about right. Weight is 107 Kg. Might be food for thought.
http://www.peirspeed.com/sunset.htm
If I think of anything more useful I’ll post later. I’ve been riding and fooling around with motorcycles a lot for 40 years and currently have eight, one posted in Europe for use there.
There is an American product, for homebuilt/experimental aircraft only, which is a kind of a “fold-out crane” (can’t think of a better description) and which enables a motorbike to be stowed inside the aircraft, or underneath it, and one person can easily move it in and out. I have seen photos of it and they may even have been posted here.
I could never move a 100kg item myself 
It looks like they got a pod for the Cirrus.
I have a “GoPed”. It fit well in the Warrior, but i am not sure if it will fit in the Cirrus
I carry a full-sized bike with the front wheel off in the back of a Grumman Tiger with the rear seats folded down, and there’s enough room for more than one. Now looking to get my hands on the lightest motorbike I can find – something like an old Suzuki RG50 or GS50.
Can we persuade EASA to approve this?
Sure. How much are you willing to pay for this? You just need an aeronautical engineer, a design organisation and money to pay them.
It would cost 6 figures at least to get this approved as an STC. Think of the required flight testing…
