While I have a variety of clutch locking tools (many inherited from other shops or owners or purchased cheap at swap meets/autojumbles) I rarely use them and they sit on a pegboard in my shop.
Instead, +1 for the Air Impact. Dont go crazy and strip the nuts, make sure your sockets are secure and nice fit. NEVER use an impact with a poor fitting socket, But most (3/8ths or 1/2" drive) have a knob near the air intake and you can crank down the pressure to start, only use what you need to break it free.
Keep in mind SOME nuts are LH thread! Sometimes turning briefly in a tightening direction and then reverse to loosey is helpful. (unless LH Thread always repeat over and over "Lefty loosey, Righty tighty!) Air impacts are one of Gods gifts to enrich our lives along with beer!
Do you guys know the German torque sequence????
#1) Tight
#2) Fukken Tight
#3) Fukken tight until it squeaks
#4) Fukken tight until it squeaks and 1/4 turn!
Back in the day I had a calibrated elbow and wrist. I could guesstimate a torque with a wrench by hand very accurately. and same with a air impact via my wrist would tell me proper torque.