Let me "Bump" this up to the top, someone might notice and help.
So many of us have done the 12" trailer wheel conversion that surplus disassembled spokes must abound.
I was going to just cut mine when the conversion time comes. However if no one offers help PM me identifying just which spokes you need & I'll pull them off my spare rear rim.
Of course this would voluntarily obligate you a debt of honor. Somehow this TW forum is a bit of a friendly community due to scarcity of TWs and their devoted owners. Thus "paying-it-forward" is encouraged and often reciprocated.
Why else would I offer assistance? Because I am a past beneficiary. Thanks Everyone!