Ken,
Your idea with the nut/bolt should work, or, just solder
the 'tail' on. Any soldered joint is going to be a bit
'stiffer' than the rest of the antenna, so keeping the joint
as short as possible would probably be less 'stiff' than a
longer one (not really, but easier to manage, maybe).
If you had another couple of reels, put the 160 meter tails
on them and use the reel(s) to 'chunk' over a tree limb. Make
the connections with the 'free' ends of the tails...
'Doc