I would not do that. Best get the proper bolts as you don't want a steering component coming off. One way would be to center punch in three equal spaces around the "top" of the nut in similar manner to prevailing torque nuts.
There is a number of styles of these nuts. The type in the photos above in a few methods of accomplishing a deformity on the thread that resists free turning on the bolt. Another uses a slit cut perpendicular to the thread and then pushed down a bit to deform it. This is generally 1/16" to 3/32" from the top of the nut.
Then there is the nylon insert type, but generally regarded single use.
An aircraft supply may be a source as aircraft generally require positive retention on all fasteners retaining structural components. Drawback could be cost if for certified aircraft.
Wicks and Aircraft Spruce deal with the kit plane industry with non certified parts and some certified. In aircraft, nylock is generally frowned on. That leaves cotter pins through drilled bolts with castellated nuts, safety wire through a drilling through the apex of one corner of a bolt or nut on a stud or prevailing torque.
Just info and options.
