English annotation by Vishnudut1926: Nice 1948 edition, speedread in 1 hour for me.
I don't remember to which Vaishnava-Sampadaya Bilvamangala Thakur (Lilasuka) belonged, but judging from some Verses of "Shree Krishna-Karnamrita" he was a Shri-Vidya (Lalita TripuraSundari upasaka).
He mentions Panchakshari-Shiva Mantra often (for example, Verse 2.24):
Not only this - the following Verse is very exemplary and sounds like pure Shri-Vidya (by the way if you read just English variant, you don't notice Lalita Names, the reason I noticed is that I belong to Shri-Vidya and my eyes see Sanskrit Names of Goddess - especially with "ल - LA" - Lakshmi, Lalita - even if I speedread):
Wikipedia also says about Gopala-Sundari-Vidya - https://en.wikipedia.org/wiki/Sri_Krishna_Karnamrutam
No wonder about this as many Shree Vidya-upasakas are often initiated in various Gopala-Vidyas (Krishna-Vidyas) because Krishna (Gopala) is more famous among Shakta-Tantriks than among Vaishnava-Tantriks (see Gopala-Khanda of "Shree Sharada-Tilaka-Tantram", for example).
Vishnudut1926, Moscow, January 2018