The neckline is way too blingy - it looks even worse in person I think.
So I cut the bling off (interestingly, it came off as one piece which might actually make quite a nice necklace - as you can see in the Afters).
I cut it fairly straight (the back was slightly elasticated and straight so I left it as is), put some pleats at the centre front to dip the neckline, and made the Butterick 8149 gathered straps.
Here is the after. This might even end up being a tripfit, since it packs up small and doesn't wrinkle.
I might need to sauce it up a bit, but I will wear it a few times first.