Please use grip glue to hold your grips in place. It works well, every time, without fail.
You should be able to get a safety wire kit at any motorcycle shop. The directions are a little vague, So practice on your old grips before removal. The safety wire acts like a cheese slicer on the grip if you wrap it to tight.
Wrap the wire around the grip twice.
Twist it until the wire barely sinks into the grip.
Cut the twisted part of the wire about 4mm long, Bend it 90 deg., and press it into the grip (so it wont poke you.
I wrap it once close to the inner flange of the grip, and again near the middle of the grip(so my fingers are on either side if the wire.
On the levers, I just run the cheap ones and keep a spare set in my tool box.