Halyard advice for Code-0

[KeepInTune]

Greetings.
I have a cruising Code-0 (w/integrated dyneema anti-torsion line) using a 12mm dacron stock halyard. When loaded up I get way too much stretch on the halyard, so I need to replace this line with a no/low stretch halyard. I'm seeking advice on the best type of replacement for my situation. I'm a casual cruiser --not a racer, but I do enjoy performance sailing. So I don't need super high-tech, but do want to eliminate this stretch issue for my loaded upwind performance.
Questions:
1) What halyard might you recommend to eliminate the stretch?
2) Cost is a factor --I need +- 40 meters of line (131 feet), so cost/foot adds up very quickly. What lower-cost options might fit me well to accomplish my goal?
3) My current 12mm halyard runs through a clutch --If I reduced my line diameter due to a higher tech solution, say to a 9 or 10mm, would this be an issue for my clutch?
4) Where is a good place to get this new halyard?
Thank you so much for your help answering my questions!

[admiralslater]

You need to match the low stretch of your luff other wise it is pointless (imo). Your furler will love you for it . As for the clutch you need to look at the specs

[Smooth Move]

It is important to have a 2:1 purchase on swivel of furler with fixation point on mast and a block to provide enough tension on luff. You will need twice as much halyard for this

[KeepInTune]

I'm not needing a 2:1 halyard, nor the potential twist/fouling issues. Just looking for advice on halyard from cruisers who've changed from Dacron halyard to something better for eliminating stretch.

[chrisr]

dyneema ex your local chandlery

not rocket science

cheers,

[The Yacht Rigger]

What make and model boat is this for?

[s/v Jedi]

You can use 22 meters of Dyneema covered with dacron outer braid (like Samson Warpspeed) and splice that to equal thickness, basic double braid dacron to save money on the end that doesn’t get tensioned.

For diameter check specs on your rope clutch. You can make Dyneema larger in diameter by pulling a thin line into it’s core.