I saw someone with http://www.thingiverse.com/thing:399284 where the filament was never moved and just used from where it was stored.
Now I don't know how feasible this is in your case, but what about getting a rod through all the filaments in your box and somehow (without compromising humidity I presume) guiding it from in the box to your UM2?
What about https://www.youmagine.com/designs/spool-holder-for-loose-filament? I use it for Diamond Age rolls right now...
There is also a https://www.youmagine.com/designs/loose-filament-holder-v3; this one fits onto the original UM2 spike but might need an additional spacer in order not to collide with the sleeve along the bowden tube.
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