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I'd suggest a 007/009.
The lug length is the same as the 013 and if you want any further mods they'll be a lot easier than trying to find mods for a 013.
The 013 is nice tho. Just has a more upright appearance, whereas the 007/9 seems a bit flatter.
I know the OP said they don't want 42mm, but the short lugs make it seem smaller.
Also as mods go, a bezel insert swap is not a hard one to do. So I think diy is very achievable.
Thanks both for the Squale recommendations. I could push to 40mm. Thanks for the link 👍 good prices and uk shipping. All the others I'd found were C24 and eBay US listings.