People have been thinking about a way to easily see how many clones are left.
How about a Clone Wallet?
(This would also give the ability to leave some spare clones in storage at different outposts ... not normally very useful, but a 'stash of last resort' for when you've just converted your last clone at a place where cost of clones is high).
(I suppose this would make it possible to trade clones, which might be a bad thing ... not sure if there are any adverse implications to this).
