If your knot-tying members are really good, they should be able to do a one-handed bowline.*
It may be more difficult with wire than rope, but it can be done.
/me perfected the one-handed bowline in a couple days, and still remembers how to do one to this day from way back when I learned it as a Boy Scout.
*The name is a tad bit deceiving. Although you actually use
both hands, only one actually does the knot tying, while the other just holds the loose end.
Actually come to think of it, I'm not sure if I even remember to tie a bowline the "normal way" anymore. lol