DIY pulleysaver safe?

First, let’s acknowledge this won’t be ground retrievable which I’ll think about a fix for later. I’ve made this DIY pulleysaver and as far as I can tell it should be safe for use as a tie in. I could have used this a few times on some removals I’ve been doing recently, mostly as my cinching spar anchor.

The loop is a bowline backed up with a double fisherman’s and the stopper at the other end is a barrel knot. Am I missing something or would you trust this?