OK, can't do much about the global supply chain in my current role as non-King of The World

Yes, I get that its safety critical and has to be 100%. I'm a Professional (Mechanical by background) Engineer and understand the difference between a prototype and a finished product.
The best thing I can suggest is just place those orders and wait the 6 months. Half a year soon disappears. For perspective there have almost been 12 half-years since this thread started.