Well, I did some more research on these mics and found some interesting information...the gentleman behind these multi-voiced "Warbler" microphones is a veteran microphone design engineer that has worked for some of the better manufacturers in China since the 80's and later relocated in Australia...he started his own company a few years ago, and he designs these mics entirely himself...the transformers are custom-wound, the capsules are manufactured to his specifications and the mics employ very high-quality capacitors and resistors (Dale and WIMA)...so they are designed in Australia and then hand-soldered/assembled in one of the better Chinese factories (and shipped from there to minimize shipping expense)...
So these are not OEM/stock Chinese designs, like most of the typical Chinese LDC mics that fall into this price range...these are new designs based upon this engineer's many years of designing for other more costly brands...most importantly, the K67, K47 and C12 style capsules being employed are built to his specifications and are not sourced from other manufacturers in China...
As far as the Oktavamod options, most of those modifications are based upon replacing the stock K67-style capsules with a K47-style capsule which tames the top-end harshness associated with the cheaper Chinese mics that employ typical Schoeps-style circuits (with no high-end attenuation) most of which are also transformerless designs...that process works quite well when addressing many of the cheaper OEM/stock Chinese mics, but the difference here is the mics are designed from the ground up, utilizing circuits that are already modified to better suit the combination of transformer, capsule and tube (when employed)...so there is no harsh top-end, or cheap components, so the need for after-market modification has already been addressed...
As a matter of fact, this multi-voiced "Warbler" model is being offered in three different configurations...the standard "87-style" as I posted above, and "47-style" (Warbler MKII) which employs a capsule very similar to that which Oktavamod uses for the majority of their mods, and a third "C12-style" (Warbler MKIII) which employs an edge-terminated capsule with extended high and low-end response...you can clearly see from the interior pics, that not only is the capsule different in each of the Warbler models, but the circuit designs vary as well as the transformers employed, as you would find in much more expensive product lines...
Here is the link to the 3U website:
3U Audio Microphones,Condenser Microphones
...you can see that there are pictures of the build interior quality of all the mics (how many manufacturers offer pictures of their circuits and the type of components employed?)...WIMA capacitors are used even in the least expensive models, while the higher-priced models boast Fairchild FETs, Dale resistors and even Lundahl and AMI transformers...
Clearly this new line of mics are not your daddy's Chinese LDC microphones...I'm hoping to try one of the Warbler variants and report back...