It would be a false economy not ot upgrade the cylinder. Have you considered upgrading to unvented hot water and mians cold. The hot water cylinder would be more exspensive but you would be sving on the cold cistern and creating more space, worth a thought.
i did look into this (megaflow) but i don't think it would work ...
the megaflow requires 20 l/min and a minimum of 1.5 bar pressure
i guess these are minimum values but the guy from megaflow (technical advice) thought it was highly unlikely that my system would achieve them
my mains inlet is reduced down to 15mm (from 22mm) immediately after the stop cock under the kitchen sink ... it then goes through a water softener (which shouldn't matter i guess) but it then would have to go up to the loft (losing more pressure)
i was nervous about it not working and also about the installation ... whilst not a qualified plumber i am reasonably handy with the blowlamp and will produce as neat a job as i've seen anywhere, i feel confident in relocating the cylinder storage tank, not so with a megaflow (regulations, pressurised, expensive !) ... bottom line is that i would have to pay somebody to fit it
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