The D104 has always been a flagship approach to the radio.
By sounds to tonal quality alone it is hard to beat.
Although the human Genome uses about 3 Billion Base pairs and has it all tied in with 23 chromosome winds of string spaghetti - that means you have at least that many different varying ways to say - "Use What Works For You" - in fewer words or less.
The field of Mics' is a lot like a meadow of flowers - they follow the sun and sometimes they stink.
What does that have to do with Microphones? Well, ever share one with someone that has Halitosis?
Many have tried and Astatic itself has been forced to come to grips with the changing times - seems the "Rochelle" salts used as the main Piezo element that makes the D-104's sound and performance so notable - is no longer being made.
It is not a "crystal" like say Quartz, but a Tartrate - a precipitant result of an acidic action between two or more materials. Potassium and Sodium - both interact being exposed to Tartaric Acid they give each other a share of the valence bonds or outer orbit electron shells and can generate piezo electricity when shaken - not unlike the alcohols used for other forms of these salts - which are stirred- which Alexander Graham Bell immediately started using both and developed a clumsy way of communication, featuring not unlike the tune of "Watson - Come Quick I need you" was the first phone call and loving savior of note sent at the same time.
So you can read about those Rochelle Salts here...
https://en.wikipedia.org/wiki/Potassium_sodium_tartrate
And the meaning of the word Tartrate here...
https://en.wikipedia.org/wiki/Tartrate
What I'm really trying to tell you here is you may not have much luck in finding a microphone that you really like unless you are willing to make your own.
Not necessarily re-inventing Rochelle processing - but more along the lines of obtain the right type of Element the mic is, and how it responds to your voice using the amplifier around it - you may need to locate and build your own.
Cheers!