You've probably already seen it, but in case you haven't, this forum's thread entitled "Shift Knob Replacement" has a few posts on shift knob alternatives and some suggestions on the Raceseng knobs (including my own).
The quick answer to your question is Yes, the listed Evora knobs all fit the Emira since the mechanism is the same, and the adapter 12x1..50which they indicate when you're ordering the knob is the correct one for the Emira as well..
It's truly as shame that Raceseng's customer support is essentially non-existant, and it's beyond me why they haven't even bothered to update their website to include the Emira model. I guess the only consolation is that their product being so top notch, you will likely never need to contact them going forward anyway. At least, that has been my experience.
By the way, one of the concerns previously brought up by other members was if the Raceseng knob, including the adapter, would install at a higher height than the OEM knob, but that definitely was not the case with mine. I happen to have measured the before and after and the same hight was maintained. One very noticeable improvement however, is how much better the gear shifting feels with my weighted shift knob.
Lastly, a word of caution and a recommendation if you end up installing the Raceseng knob.. Follow this order: 1) Place Loctite threadlocker on the inside screw section of the adapter and then screw it on to the Emira's shifter arm (aka shifter fork); 2) once you've let the loctite set in well (at least one hour), then you can screw in your Raceseng shift knob, on trial and error basis, and adjust it with the adapter's top screw, until you get the correct orientation (should yours have engraving); 3) once the correct orientation is achieved, you could alternatively secure the shift knob to the adapter using loctite on the external screw side of the adapter.. Btw, I didn't do this 3rd step, as I found the shift knob to stay firmly in place (after driving it around a bit), without the need for this second step loctite. The order of steps 1 and 2 is important because the adapter will easily get stuck inside the knob, if you screw it in there first and becomes practically impossible to retrieve it.
Hope you find this helpful.