Orpheus 3B and MAI-Voice-2 are available through the OpenRouter API, so switching between them takes a model slug change rather than a new integration.
Orpheus 3B, from canopylabs, has a 4,096-token context window and is priced at $7/M characters on OpenRouter.
MAI-Voice-2, from Microsoft, is priced at $22/M characters on OpenRouter.