I got some lock-ons, and don't want to change the position of my controls, because I have broad shoulders as is, . . .
Currently have a 660 wide riser and the lock-ons are about 12mm over the end of the bars, so the end plug does'nt work, i've of course tightened that end up anyway and tightened firmly the lock that is actually on the bars, . . .
Is this safe for the time being until I get a 685mm bar? Or am I risking life and limb?
Depends where you hold the bars I guess. If you ride on the ends of the grips then there might be an issue. If you hold the bars inwards if you like then aside from the fact they aren't held as securely, I can't see a problem.
Some lock-ons only lock on at the inner end anyway.
As a temp measure, can't see too much of a problem*
*other opinions are available, and may well be along shortly...
ignoring the fact your lock-ons will be half as secure and the end 12mm will be unsupported, depending on the style of lock on you may also cause wear to the plastic interface causing a loose grip defeating the purpose of running lock-ons in the first place, depends how you ride tho.