Here's some various Mikasuki language documents on this page, with varied use licences... might be the best Mikasuki language directory we've got on the net as of late 2018...
ELP Language
Mikasuki
Resource Types
Website
Media Image
Placeholder 3
Tag
Linguistics
Grammars and Language Description
Archiving
URL
http://www.language-archives.org/language/mik#lexical_resources