We live in the desert and have water restrictions. Our cemeteries don't even have grass. We have trees and miniature cluster palms, Agaves, rosemary but other than that, everything takes a lot of water and he rips out anything planted.
Links: VIVOSUN Digital Heat Mat Thermostat Temperature Controller 40–108 ºF for Seedlings, Germination, Rooting, Fermentation and Reptiles
Timer https://www.amazon.com/gp/product/B015F4VFGI/?tag=exoticpetnetw-20 Govee Wireless Thermometer Hygrometer, Mini Bluetooth Humidity Sensor...
We use an Oil Radiant heater on a thermostat behind cinder blocks in our big guys den. We bought it from Amazon and it has been amazing even with snow. His house is fully insulated with 3" foam board and caulked to keep heat in with a Govee that goes to my phone so I can check temps inside...
I'd do everything I could to keep him hidden until you can figure out a way to comply or during appeal process. If they don't see him, they don't know hes there. They can't go into your garage w/o permission. If not possible, I'd look at foster before rehoming if you want to keep him.