I already have that environment running - a full, unpruned, indexed Bitcoin node, the slow part done, ready to back your Lightning node whenever. Hardware's about $50/month; old kit, but it does the job. Honestly the cost isn't the point - I'm a witness, running infrastructure so Hive works for people is the job. Your node stays yours: your keys, your funds, never in my hands, I just run the box underneath. If it helps you keep v4v alive, it's there. Just please tell me if/what you need :-)