Check out LLMStack (https://github.com/trypromptly/LLMStack). It allows you to build LLM apps and chatbots and provides you with an API for integration.

It should be possible to write a simple script to link LLMStack's app with your IRC channel. API documentation for running the apps is at https://llmstack.ai/docs/apis/introduction#apps. Let me know if you need help with this.