I really, really do not recommend this.
First, the purpose of the half-cock notch is so that if the nose of the hammer breaks or if it jumps the sear, the sear will intercept the half-cock notch and prevent the hammer from hitting the firing pin. If, on the other hand, the hammer is at half-cock and the half-cock notch jumps the sear, then there is nothing to intercept the hammer - it will hit the firing pin -- hope you have hard primers!
Second, this now requires manually cocking and decocking the 1911, which is a lot more likely to result in an ND then just leaving the damn thing alone. What do you think is safer:
1) Take the cocked-and-locked gun out of your holster, put it in the safe, or
2) Take the cocked-and-locked gun out of your holster, lower the safety, grab the hammer, pull the trigger, start to lower the hammer, release the trigger, slowly release the hammer, put it in the safe.
And when doing the reverse:
1) Take the cocked-and-locked gun out of the safe, put it in your holster, or
2) Take the half-cocked gun out of the safe, grab the hammer, cock the hammer carefully, apply the safety, put it in your holster.
Which of those two is more error prone? Remember the KISS principle?
Third, this complicates the manual of arms. If you normally carry a 1911 cocked-and-locked, and you normally practice that way, then you expect to be able to lower the safety and pull the trigger. If someone breaks in at 0-dark-30 and you grab your 1911 which is at half-cock, chances are you will try to lower the safety and pull the trigger. By the time you figure out why it didn't go off, it may well be too late. If your gun is sometimes condition one and sometimes at half-cock, chances are it will be in one condition when you expect it to be in the other, and that is just really bad juju.
If you like 1911s but are worried about it not being drop safe, then for goodness sake just get a Series 80-style gun with a firing pin safety. Carry it condition 1 and if you want to store it in a ready condition, store it condition 1.
This. But what would I expect from a guy with the handle "1911." When I first started carrying my 1911 in '98 I carried in Position 3 (empty chamber, hammer down and mag loaded) for a year until I realized that it was "dangerous" from a protection standpoint. I carry Position 1 and have been for years.