It depends
Hi there,
Hitches only weaken a line by about 20% in X; splices are preferable, not because of the greater ultimate strength, but because they are the most chafe-proof, fairest, and secure knots.
Spool shackles allow for a quick disconnect, but Diamond-knot-based soft shackles are nearly as fast, and much cheaper. As for the headboard, "tight radius" is a relative term; the stronger the line is, the lower the relative load, and the less the problem, even without considering how a doubled (ring-hitched) part lowers the relative load further. Fairing the edges of the hole would seem to be an option, too.
So to answer your question, my first choice would be a spliced halyard with a Diamond-based shackle. If more speed were required, look at a spool shackle. And if price drives everything, Buntline hitch, and deal with untying it.
Fair leads,
Brion Toss
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