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Thanks, a backing board seems like a pretty good idea. I have some hardboard the right size but I’m guessing ply would be better.
I like the look (and price) of those Rymans hangers too.First job is the shelf - I’ve got a nice piece of planed sapele and some tung oil in the garage... Just need to find a decent method. Every YouTube video contradicts the rest!
Dramatic_Hammer-
Hardboard is totally fine. It may be advantageous as a bit of flex will help it conform to the uneven frame. The board will mostly help keep the frame square - and therefore strong.
Rymans are definitely my go to, but they are a bit spendy if you've got a house full of pictures to hang.
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Bit late with this but concealed shelf supports do work. I've used them for quite a bit of weight before.
Nef
Airhead
Looking at those pictures, you could happily add a backing board to add a bit of strength.
I'd advise against a split batten/french cleat as mounting it will be a pain in the arse/nerve wracking in terms of avoiding the mirror with the screws.
I'd go for Rymans or strap hangers into the frame at the edge, and sit the frame either on L brackets at the bottom or the wood shelf you mentioned before.
Link for Rymans:
https://absoluteproduct.com/ryman-hanger.html
Let me know if you go for Rymans and I can hopefully offer some pointers - they can be a bit of a devil to use, but there's a couple of tricks to make life easier.