Sure would be nice to remotely unpin. This is a huge waste of time flying out to unpin a blueprint.
As with a variety of things in ED, it seems like this might've been deliberately designed as a "gotcha!" thing.
Thinking about it, I recently had a
BIG near-miss with this stuff, a couple of months ago....
I'd already pinned Heavy Duty hull-armour from Selene Jean and I decided to go to Colonia and pin Light Weight hull-armour from Petra Olmanova.
Having arrived in Colonia, I found the HD armour BP had unpinned itself, which was kind of annoying but not the end of the world cos once I unlocked Olmanova I could easily carry out any armour mod's with her.
Before I headed back to the bubble, I pinned one armour mod' from Olmanova and then, when I arrived back in the bubble, I pinned the other one from Selene Jean.
I then realised that the Light Weight mod' was pretty-much pointless since it's usually better to apply a HD mod to a light-alloy hull (which weighs nothing) and then reiforce it with a HD HRP.
Doing that will always(?) give you a tougher hull, and less weight, than fitting, say, MGC armour and then applying the Light Weight mod.
That meant I could now un-pin the LW armour mod and replace it with a HD HRP mod instead.
Except that, if I'd pinned LW armour from Olmanova, it would've meant I'd have to
travel back to Colonia just to un-pin it.
Fortunately, as it turned out, I'd pinned HD from Olmanova, which meant I only had to visit Selene Jean to un-pin LW and replace it with a HD HRP mod' instead.
Dodged a 20,000Ly bullet there.
But yeah.
Lesson being, think really, really, carefully before pinning BPs from the engineers in Colonia.