Had the same issue on my 68 Caravel
. Really thought way too much about it, but that's the way I do things.
I used pex with push fittings. (Sharkbite is one type) I haven't tested yet, as the low is 20 degrees this week. Pex is cheap. Push fittings are expensive compared to clamp fittings + tool.
Ultimately I want to use the thing, so I went for speed (pex/push fittings) and low skill. Pex and clamp fittings are speed and maybe a little more skill, and then copper is for plumbers.
By the way, you sound like the person who called me in Alabama about my 64 Safari...in grad school and all. Glad you found one!