Balloons... argh!

I've been in possession of the Balloon Bed for over a month now...
An attractice proposition at 100gms and very small pack size.
For £20 you get a sewn ripstop nylon base for holding the 260q modelling balloons supplied - you also get a small hand-held pump and a safety pin for bursting the balloons next morning...
My intention was to see if it could be adapted for multi-day use, after all balloons don't weigh much. Do they?
To be fair it's designed for mountain marathoners for a single night's use and not intended to rival a Thermarest.
It soon becomes apparent that mountain marathoners - OMM and KIMM etc. - have time on their hands, as you have to blow up 7 balloons (original version) with a small plastic pump provided, one at a time of course, and feed them into the sleeved ripstop nylon base.
As the balloons are intended for single use only, my first thoughts were for re-using the balloons and instead of knotting them, I tried other ways of sealing them so that they could be undone as it's reported that some thrifty MM's undo their balloons next morning...
Wrapping a few times around a curtain hook and tying off with a burst balloon were the most successful, though this can 'stress' the latex, creating a weak spot...
It has to be noted that the idea is quite ingenious and if you don't tend to move about much it's very comfortable for it's 100gms but I found that the the tendency was for the seven balloons to narrow beneath my body weight - in that they 'migrated' closer together reducing the width of the support.
I made an improved version out of taped-together Mylar sheet (Emergency 'Space' Blanket) that kept the balloons in place under tension. But this new design required 8 balloons and I added a shorted sleeve either side to beef up the shoulder/upper arm area requiring yet 2 more albeit smaller balloons - 10 in all.
Well I gave it a proper trial last Friday night... only to have 2 burst within the first 20 minutes, and had to get up again to pump up 2 more...
All was okay till around 4-5am when my hips felt chilly, but it was still relatively comfortable...Well it must've been 'cos the neighbour was going to work when I finally ducked out from under the home-made tarp.
Under pressure the balloons had gradually gone down - they deflate from the end opposite the blowing-up end - hence the cold hips. Though this would help get you up early...
So until I can find a better way of sealing 'em - it's back to the Ridgerest (now further trimmed down to 180gms)
The Balloon Bed does have potential for multi-night use though (if balloons stay inflated that is) but if a supply of balloons has to be carried for each day's use the 100gms (includes base, 7 balloons, pump and pin) starts to become nearer 200gms...
Meanwhile a self-inflating Pacific Outdoor Uber Lite is on order (241gms stated weight)