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The halyard is rope/wire because traditionally wire had less stretch than rope, and when hoisted the bulk of the halyard under load was the wire.
Today's "rope" is much better, stronger, stretches less and is and simpler to deal with; you avoid wlre's "meathooks", on and on it goes.
Your limiting factor might be the sheaves in the masthead, which may have a v-shaped groove and be sized for wire only. Running line over them may not be optimal. Others have a two level groove, wider for the rope and a narrower deeper one for the wire. Neither of these types are really meant for line-only for a long period of time.
Today's line halyards are strong enough that they can be much smaller line size than what you probably have now, but then handling them is harder on the hands. A larger cover can be sewn on to assist that part of things.
Talk to a chandler about their selection of line.. they'll have some suggestions.
1984 Fast/Nicholson 345 "FastForward"
".. there is much you could do at sea with common sense.. and very little you could do without it.."
Capt G E Ericson (from "The Cruel Sea" by Nicholas Monsarrat)