Anyway, no lemming sprites other than "default" contain Reacher and Shimmier sprites.
This is not true; I have already updated my Beach and Egyptian lemmings with Reacher and Shimmier sprites several months ago and shared them in the thread where all the other custom sprites (Highland, Shadow, and Machine) are uploaded as well.
It might just be that the Beach and Egyptian lemmings aren't part of the regular NeoLemmix download yet - but then again, I think this applies to the other three custom sprites as well?
Highland, Shadow, and Machine are still missing, which is why I raised attention for that in the respective thread recently. I can try to recolor the Reacher and Shimmier sprites for those three as I did for Beach and Egyptian, only using Paint.Net this time because I don't have a fixed Photoshop Scheme containing the appropriate Hue/Saturation/Lightness changes for Highland, Shadow, and Machine.
But of course, these sprites were created by Nessy, so if he can find the time to update them himself, I wouldn't mind.
The same applies to Arty's Water Lemmings and the all-black sprites for his Silhouette tileset, I believe. (I haven't used either of them yet.)