If you're building a frame that will help channel owners automatically approve and invite new members, reply with a link.

Burnt the midnight oil and ended up with two things: 

https://castkeys.xyz - This is an open source app designed to help users create their own signers. No external services outside of Warpcast to approve keys, all ephemeral state. Has instructions on how to run locally if you want to go that far! I had this idea a while back but slept on it until I needed it for the next app

https://github.com/PinataCloud/channel-frame - This is an open source and simple frame that allows anyone to deploy a frame for their channel to allow anyone access to membership. We might build some access/moderation controls later, but we primarily wanted any of our users to post in our channel and get help if they need it. Figured others may want that too! Has a single config file you can edit with your own info, and of course you'll need a signer for either the owner or moderator of the channel :) 

https://warpcast.com/stevedylandev.eth/0x4870534b

https://warpcast.com/stevedylandev.eth/0x9e4d6556