What ppl usually do it use a contract manufacturer. You + competitors + adjacent or similar products all built in the same facility. The manufacturer buys in bulk for everyone across the common components.
You're on your own for your unique components. Sucks but it's a lot less surface
This...
Diversifying sources is best practice ... it is also costly, and brushes against constraints such as MOQs. Sailing industry is low volume, it's hard to get your suppliers' attention when you are small volume buyer, and then having 2 suppliers for that input, now you have half the volume with...
... who isn't? – I broke a Nacra 15 mast just before a regatta and working with Red Gear Racing we found I think the only spare in the US.
I know of a batch of small catamarans got severely delayed in their cross-atlantic shipping due to shipping companies pulling abusive "we're overbooked your...