Update for anyone following here, and praise given where EXCEPTIONALLY due:
I contacted @cruisermatt / CruiserOutfitters, whom I've done business with for many years for any L/C or Solid Axle Toyota I've had, and they triaged this issue in a single day. They asked specifically about how the issue happened, and any inducing factors (e.g. clapped torque wrench, etc.), and then had their people look into it. Within 24hrs, they sent me a replacement part, and wished me well.
BY COMPARISON, 5-7 years ago, I had (somehow ironically now) the SAME issue with a set of 555 Sankei TRE's bought from another long-standing Cruiser-specific company. I asked the SAME questions, and asked for some type of help or compensation... and they called me and brow-beat my ability to wrench on my own vehicle. I had to re-order, at full price, and vowed to never buy from them again unless absolutely necessary.
Thank you. Seriously. This really reminds me why, in the 'modern era' of FB groups and posting for optics, and even flash-in-the-pan marketing... that there's integrity still out there in a long standing community for this old iron.
Ride on.