BillT, I hope the combination works out for you. My dad's place is about 20 miles south of you and has the same problem, except it's over his front entrance. He's got a fairly typical (for Arizona) gabled entry way with beams on both sides of the roofed area over the double door entrance.
Pigeons decided it would make a great place to nest and stay out of the sun. Dad's 94 so he's not getting up on a ladder to deal with them. BIL lives nearby, but he already took a header off his ladder trying to change the porch light at his place, so he can't deal with it. That left me.
So, I started by putting up a mess of bird spikes to make it impossible to land on the beams. But, what looks impossible to me just seemed a minor inconvenience to the damn pigeons. So, I put up some more spikes. Literally covered the entire beam surface with spikes. The place was covered with bird sh!t within 2 days.
So, I got a snake--plastic, but formidable looking--and stationed it on the beam.
Kept the damn pigeons away for about a week.
These dang things are not squab. They live in the dessert and eat garbage. They might be edible if someone was REALLY hungry, but I'd probably eat the neighbors before I tried eating those birds.
So, I put up an owl. Seemed to work.
I came back to Florida feeling like I had made a difference at my Dad's place. Few weeks went by and my smugness was destroyed by my sister's email. "I jut cleaned about 10 pounds of pigeon poop from Dad's front porch."
Dad's moving to an adult living facility in the next couple of months, then I go back to Mesa to help sis get the old homestead ready for market. Still have no idea what I'm going to do about the damn birds. Let me know if you have continuing luck at your place. I may have to come take a look at what you've done so I can adapt.
Crusader Rabbit