Surely this is the perfect opportunity to exploit the unique attribute all our bikes share... electric power!
I wonder what the smallest. Lightest 12v compressor is? I took one out of one of those cheapo (useless) jumpstart packs and screwed it to a lump of wood. It lives in the garage and i have been using it to inflate all sorts of tyres, it easily does 120 psi roadbike tyres. I guess 36 or 48v might make it spit fire but if you got a mini 12v one in conjunction with a kit that output say 12v cig. Lighter socket then the output can be used for other stuff like charging bike lights or phones etc. With a usb adapter.
The compressor i salvaged is tiny probably smaller than the size of a pack of cigarettes and light ally and plastic gogs, weighs feck all, if you hand held it to stop it flying about on the floor it would be very small.
Afterall who flattens their lithium batts or ever uses all their battery range, i'm sure we all have capacity to spare. Turn your bike into the AA van of the cycle path lol! I would feel guite smug knowing i had a power pump in the bag. Springy thin power cord as its only got to reach like 1m each way, super short pipe so you hold it right near the valve while its pumping. Oh and a pedelecs.co.uk logo moulded in the handle! Sorted