Have only lost a rudder while sailing a
dinghy. I couldn't sail it properly just by sail trim, so sails went down and waited for a tow. My opinions and comments:
1. I too didn't think that it is possible to sail without any rudder at all, HOWEVER, I learned something new from this topic... that I should try using drogues and other stuff to counteract weatherhelm, that might work. Nice tip! This was the first time I heard of this, even after checking out "sailing without rudder" in the net and in some sailing books. Seriously. (I've only 16 years sailing experience)
2. On my 33 foot racer cruiser, we have a piece of plywood with U bolts, dedicated Emergency rudder, the spin pole is used with it.
3. On my friend's 45 footer when we tried a bigger version of my system, it failed, really difficult to steer (even with just engine), so we ended up just buying a pair of drogues.
In my humble opinion, those who say that asking for a tow or anchoring when near shore has the best idea. When out offshore or in blue water, one has more time to experiment and juri
rig, but in any case the best advice is to advice the coastguard of your situation first before trying to find a fix.
Lastly, my co owner who has his own boat in Japan had a big spare rudder built out of wood and FG, and made gudgeon and pintels on the rudder and on the transom of his 30 footer. So that if the primary rudder breaks, he just goes and attaches his transom mounted emergency rudder!

Cool, but the E rudder is heavy and takes up a lot of space
TTFN
Arvin