Short answer is NO, there is no such a component. Here is the topology for R series crossovers
For midrange it is 12dB/o high pass filter and 6dB/o low pass filter electrically (acoustically it is a different matter).
If you pay close attention to schematic, woofer has 6dB/o electricall filter (LC for cone breakup controll, and RCL for 100Hz hump) and since crossover frequency between midrange and woofer is at 450Hz, woofer participates in sound quite a bit - even at 1000-1500Hz. Problem is that woofer starts to beam off axis at that frequencies so resulting power response suffers. Also, if you look at Kef Reference 1 measurement done by Anselm Goertz, same thing is observable there. Shallow slopes and as a result a slight depression in horizontal directivity between 1000-2000Hz.
Cure for that would be DSP controlled active version (since doing it pasive needs a showel full of components with very large values). I did try that but still found the sound lacking some transparency in lower mids. Sold the R300's and never looked back. I would like to get my hands on a pair of dual-concentrics from R series though. They are a marvel of engineering in my oppinion, sound great and are built like a tank.