Just a notice/update - Some years ago I was looking for an integrated life jacket/harness and posted to the group. I/the group found a company but they had no stock and didn't have an expected delivery date. They have just contacted me to inform me they are now back in stock/business and while I'm getting out of beach cats (tris are so much easier on my surgically repaired back), I wanted to pass this on noting I am not affiliated in any way - https://www.bloodredclothing.com/product/integra-dinghy-sailing-trapeze-harness/
Thats quite a cool product.
Not USCG Approved. That doesn't mean it can't be used, but.............
I took a spin at this a while back, that is a PFD integrated into a harness- even mocked one up. I gave up after reading the USCG approval process, let alone the insurance requirements.