Ah, yes, loosing workshop space is a bit of a nuisance!
Thinking laterally, if the toobs are off the hull, could you get away with only inflating one or two sections (depending what part you are fixing) and do it in the house?
or your garage / shed if you can make enough space? Then when the weather improves, you can stick them back on in the garden.
Nothing wrong with a tiller rib. I used SR4s with a yam 30 tiller version years ago at an outdoor centre. No console = oodles of space & the tiller means you have ultimate manoeverability!