BMW Motorcycles of Escondido is now renamed Moto San Diego, and they have expanded their line-up to include Moto Guzzi and Aprilia, instead of being a one-brand shop.
https://www.motosandiego.com/
At the moment, they are only showing five Moto Guzzis and five Aprilias in stock. But I think it's worth a ride over tomorrow morning on a Moto Guzzi, just to get acquainted.
This shop tried carrying some Piaggio brands several years ago, but it failed. I don't know the circumstances, but I think that was at a time that a lot of people were complaining about how hard it was to work with Piaggio. Hopefully things are better now.
This shop is right around the corner from Moto Forza, which carries Ducati, Husqvarna, Triumph, MV Agusta, Royal Enfield, Vespa.
Previously, my closest Moto Guzzi (GP Motorcycles) was 30 miles away. Now I have one only 14 miles away. Much closer....