voidware...
The 7' hose is not easier to grab than a 3' hose, unless you've got it hanging out everywhere, which is a huge no-no.
Besides, you WANT the OOA diver to grab your long hose. The long hose sits on top of all over hoses and gear, and is deployed simply by tilting your head down. A panicked diver who is kicking frantically can be easily pushed away on a 7' hose. Of course, the 7' hose does not solve every conceivable problem, but it solves a lot more than does the 3' hose. The 7' is much less of a risk to the donor than the 3' hose, despite its "larger area to grab onto."
The backup necklace is not any kind of a strangulation hazard. It's on shock cord that probably stretches to three or four times its relaxed length. Your buddy, or other agent of menace, will have to be pulling at your backup reg, from behind you, with some rediculous amount of force to choke you. Even then, you'll have several minutes to decide what to do about it. The easy answer is to remove your knife (since it's readily available, right?) and cut the shock cord, or simply stab the offending buddy or agent of menace.
![Big Grin :D :D](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
You should certainly be able to do this before passing out from asphyxiation.
Most people use a ziptie and some stopper knots to afix the shock cord to their regulator mouthpiece. I'd be willing to bet my life that your reg's mouthpiece will simply come off under the amount of force necessary to choke you. If you're really that unrealistically paranoid about being choked by your necklace, affix your shock cord with a rubber o-ring and a bowline knot. Give it a sharp tug, and it'll break right off.
- Warren