Publications in this area are appearing with increasing frequency. I have not made any particular effort to keep track of them. The ones I have found sufficiently or more than sufficiently rich are:
Narendra. 1996, reprint 1997. संस्कृतस्य व्यावहारिकस्वरूपम् : Functional Sanskrit: Its Communicative Aspect. Puduccheri [= Pondicherry]: Saṁskṛta-kāryālayaḥ, Śrī-Aravindāśrama.
Joisa, Sowmya (and Vinita Sharma and Sharada Varadarajan). 2013. Mukulam. San Jose, CA: Samskrita Bharati USA. Postal address 4204 Latimer Avenue.
There is an older book by Hajime Nakamura on conversational/spoken Sanskrit, which is useful but would be inadequate for sustained and systematic study.
a.a.
I am searching for any known (digital or otherwise) dictionaries/phrase books/word lists of conversational Sanskrit.
If anyone is aware of any such resources out there I would much appreciate.