Bifrost with Model Garden

Hello,

So i've deployed Bifrost, and have a Model qwen2.6 deployed via Vertix AI Model Garden with a dedicated endpoint..

However now i'm stuck on how we authenticate Bifrost with the dedicated endpoint? We don't want to obviously be using auth keys which expire every 2 hours. I was hoping that we would be able to use a attached service account, but is isn't supported under custom providers in Bifrost, only under Vertix AI which then doesn't support dedicated endpoints

Does anyone have a solution or an alternative to Bifrost which allows such a setup?