plenty of people drive around on totally torn apart engine mounts and many never know it.
my dumb drifter friend had both mounts totally torn apart. you could see the engine rock when kicked it.

The thing is, the bolt in the stock mount isn't exactly straight, so what happens, is when you shove a bolt straight though, it gets torqued around pretty good and ends up snapping and that's what falls apart, the pucks vibrate out and now the engine is tilted over on its side.

What you "could" do, as it has been done time and time and time before, and again, is go to home depot, get a tube of the polyurethane construction adhesive, some rubber gloves and a couple of bad stock mounts and either cover the whole thing with the stuff and let it dry, or, get really crazy and do on half of it, let it dry. so that it will hold its shape, then cut out the stock rubber, put in more goo, let it dry and just do a little bit at a time until you've made a solid mount. Then just shave away what you don't want/need. re-shape the whole thing to the way you want it. It'll work for a while and be nice and stiff that way. Typically, they end up tearing apart from a crappy bond between the metal and the poly when you pull the engine out, so that might be a hurdle to overcome.

From a liability standpoint, they have to test their mounts, but it is the same poly you can get, and it is poured into a mold. They have a system of some sort to ensure no air pockets and good bonds and all of that.

Oh, and another major problem people have doing the whole puck thing is that they make the engine sit lower since two pucks isn't as thick as the stock mount. A lower engine means the oil pan catches on more shit. That's what looks like what might have happened with that car in that pic considering the engine was still sitting up right.

It would have to be a pretty serious situation to really jack crap up if the mounts fail. All three, (including the tranny) would have to fail for the engine to "fall out" or spin around or anything like that.
So while there is some risk, it is a rather acceptable amount of risk to test you ideas on.
You'll know when it starts to go bad long before it is totally fucked.