Way to much trouble for what you'll get out of it. I say leave both alone have a cold cocktail and fire them both up. Let them get to know one another.
You can also smoke on a Weber kettle with great results so take a minute and think about what you will do more smoke or grill. Me I use my grill and rotisserie more than all my smokers.
Mine would be to order some Todds Dirt seasoning. Rub the lamb down with evoo then granulated garlic and Todds Dirt. This stuff is made for lamb,pork,chix and prime rib. Trust me I've done it dozens of times. Lamb is our all time favorite.
DO YOU KNOW ABOUT THE BEND TEST? IT'S WHEN YOU PICK THEM UP WITH TONGS AND THEY HANG ALMOST STRAIGHT DOWN THEN THERE READY TO SAUCE FOR ABOUT A HALF HOUR.SAUCE LAST SO THE SUGAR IN THE SAUCE DOESN'T BURN. SORRY BOUT THE CAPS. START CHECKING BBACKS ABOUT 3 HOURS IN.
Yup the Weber kettle does great work on ribs. People have been grilling them for fifty years now. Sometimes I throw a rack on there with nothing but salt and pepper and they come out tasting toatally different than smoked ribs and I mean in a good way. Nice work.
I'm with George I have never in three years had a problem with temps. using the Weber rotisserie. Even with the air gap everything always comes out great. I do kind of a minion method when I grill though. Maybe that is the secret.