Unfortunately no. This is a “limitation” in the Arlo implementation. You can only have 1 Arlo account tied to your hub.
I have a similar setup and I’m slowly migrating over to Foscam IP cameras and thinking up other uses for my Arlos. The Foscam cameras are a lot cheaper than the Arlos and have many more options for local recording and such. I wish I had found out about them before I bought all the Arlos, to be honest.
I despise closed systems . Main reason I am replacing all my Canary. Two years is long enough to wait for their promise of an open API and integration. Cloud is a great option, but should not be a requirement to use hardware I paid for and own.
I thought maybe you could connect to the Arlo hub locally, not the cameras directly
I am not sure what folks were doing for Arlo+ST before the integration was officially introduced. I searched GitHub and the ST community apps list for Arlo devices without success.
One thing that just occurred to me is Stringify. I believe Stringify will allow you to have multiple Arlo accounts (I haven’t tried it though). Then you could use Stringify flows (integrated with ST) to perform actions upon camera events.