Does anyone have experience doing the same on GCP? In particular right now I am trying to add live reloading to my App Engine Standard app but Standard doesn't

Does anyone have experience doing the same on GCP? In particular right now I am trying to add live reloading to my App Engine Standard app but Standard doesn't support long lived connections (so no websockets) and App Engine Flexible seems like it will be pricy. I think I can set up a single separate websocket instance which is only responsible for doing listen/notify on postgres and telling the client when it's time to refetch from the main webserver again. Does this sound approximately workable? Will I actually be able to reach the connection numbers like in this article?