I did fit some quill (expansion) levers on my RB010aa, I used Tektro ones, just had to remove the conical shim. For sure is not it was supposed to be used, but still it's firm and works fine ;)
@radj if you like I have a spare one. It's a left, but apart the branding, removable I guess, it's the same as the right one. It uses mtb cables.
The model is Tektro rx 4.1