I normally when on a yard, I drive straight to the point of work, typical auger work. Then back up to a point where I can angle and drive straight to the next hole. You could always trade off on a A300 all wheel steer.
I have a 763 and have two sets of tires. One new set of 10" and one set of 12" very used (almost slicks).
I bought the 12" set in their worn-out state. I use them on lawns and on pavement. They do a lot less damage to lawns and on pavement they will turn much smoother don't jump around near as much. (It's even smoother if you can spread a little dirt on the pavement where you need to turn sharply.) The best part is once the bars are worn off, the tires wear very slowly and will last a long time.
I heard about using bald tires from my brother who worked as a mechanic for an old excavating contractor. The guy had numerous sets of bald tires and my brother would get the schedule to tell him how many skids he wanted bald tires on vs how many he wanted "good" tires on. He did a lot of tire changes but it kept everyone happy.
It doesn't take much time to change them. Put a floor jack under the rear, give it a few pumps and roll the bucket to lift the fronts off the ground. Grab the impact and go!
If you want an extra set of tires check with the dealers in your area, Craigs List and the like. I got my tires and wheels from a Cat Service Tech, $100 for the set of 4.
The Cat dealer he worked for scraps the wheels from machines they service through a service agreement. They take a new set of wheels to a job site to replace a worn-out set. The dealer has to pay an employee to dismount the bad tires so they can sell or scrap the rims and tires. They told their Techs that it is not cost effective and allow the Techs to take them if they want them. I found the guy on Craigs List and he had multiple sets for sale.
The other source is sets of tires that have been foam filled. I have been told they can not be removed from the rims with out cutting them off. The guys that get them foam filled know they will replace both the rims and tires when they are through using them. Ask around, you may be able to get a set for free.