Kimpurusha/Pulukisi/Purski could be a mistaken identity on Namcot's part. In MT1 it is a horse but in every other game it has appeared in (including MT2!), it is an elephant. It even evolves in Ganesha in SMT3.
This is Purski's Nocturne profile:
"In Hindu mythology, he is a god with an elephant's head and a third eye on his forehead. Although his looks suggest Ganesha's influence, he is thought to have originally been a local god of Tibet."
Here is it's Megaten Wiki entry:
"Another name for Airavata, the magical flying white elephant that serves as the steed for the god Indra. He is said to cause rain to fall after droughts."http://megamitensei.wikia.com/wiki/Purski
The Kimpurusha seem to be a tribe of mystical half-animal deities (half-horse or half-lion) so you are probably right about the demon in MT1. The wiki says they are also related to the Kinnara which are also horse deities in Hinduism. Namcot may have made a mistake transliterating it into Japanese for the first game and then they probably realized their mistake and fixed it in the sequel by making Purski's sprite into an elephant.
You mentioned the Pulukisi dance in a previous post.
Well, this is what Google Books says about Pulukisi:
"Pulukisi is a bamboo-made elephant, covered by cloth over its body and with a big elephant mask on its head. Moved by two people inside, the elephant roams around Kathmandu during Indra yatra in search of his master Indra, whose vehicle is the elephant Airavata. During the rest of the year the white elephant mask is, together with the image of Indrayo, kept in the Kilagal Ganesa dyochem, which again has its own guthi."link
Skotinka seems plausible! But maybe if someone looked into the GBA profile in SMT1 for Stonka, we'd get some more clues. There's supposed to be a library with profiles available in the GBA ports of SMT1 and SMT2 for each of the demons. A lot of the stuff on the wikis is unsourced and seems made up IMO.
Changed name of a link to fix table borkage.