I'm afraid you'll have to go through renewal every 3 months, but I'll still make a shameless plug of my client [1]. It uses DNS validation exclusively so you can generate certificates wherever you want.
In addition, domain authorizations last for 10 months, so you don't have to go through the DNS verification each time: just renewing is sufficient. Run the issue command, drop new certs into configuration management, done. Couple minutes tops. Just set your calendar!