Before you go forward with that, you may want to contact Twitch as such a service may be in breach of the developer agreement, two key points (but not the only points relevant) are
II A 2
Program Materials: certain software, software development kits, libraries, application programing interfaces (“APIs”), services, documentation, specifications, sample code, metadata, technology, emotes and any other related or ancillary materials and information that are made available under this Agreement to you by or on behalf of Twitch pursuant to the program you participate in on the corresponding Schedule.
Schedule 1 - Storage of Program Materials/Twitch Content
Re-syndication of Program Materials as available from a Twitch API is prohibited.