secondary literature on the use and
incorporation of tribal/local myths into Puranic (and/or Tantric) mythology

without the outlook of 

as "Hindu-Brahmanic" 's tool for the absorption of
local/tribal traditions with a specific political purpose.
Can be in big number. 
But the title of the post brings emphasis to 
as "Hindu-Brahmanic" 's tool for the absorption of
local/tribal traditions with a specific political purpose.
Attributing motives particularly political to cultural developments such as entry/diffusion of tribal/local myths into Puranic (and/or Tantric) mythology is typical of Marxist historiography. 
Right from D D Kosambi through D P Chatopadhyaya, many belonging to this school published a lot on these lines.