Originally Posted by
FBinNY
Many people remove the levers and install just the bodies. This is especially popular for tandem stoker's bars.
Otherwise, depending on the lever, some kludge for hamming shouldn't be hard for anyone the least bit creative. The simplest would be to buy non-aero levers and fit a thin screw and nut along the cable path. Other ideas will depend on the specific lever used.
I've seen levers cut down to where the pivot area narrows down to the rest of the lever to provide a smooth top/front to the hood. With a well thought out cut and some filing, the end result looks nice. This doesn't address the OP's question on locking the lever but now that cut down lever needs far less of a lock since it cannot be squeezed.
And a thought I just had to lock the lever. Drill a small hole through the body and lever on the side say 3/4" from the pivot. Tap for say an M4 screw. Now drill just the body to clear that screw. Countersink for a nice SS pan head screw. Doing both sides would add symmetry and probably hold up better also.