I'm a firm believer in following what the side of the barrel says. If it doesn't say .454 Casull on it, don't chamber one in it. Similarly, if you had a set of cheap tires that were speed rated at 88 mph, would you use them to race at speeds of 150mph? Unless you've got a screw loose, I'm sure the answer is "NO"....and the reason being is because it's unsafe and you could get hurt or even killed. Why do a similar thing with a firearm?
If you want a .454 Casull handgun and need a rifle to go with it, then check into an H&R Handi. I believe they chamber a .454 Casull barrel. I have one in 45 Colt and it is very nice. In fact, I bought it to spare my Win 94 the beating it's been taking.
On another note, if you read the article in which I sent a link, Paco Kelly shows data indicating that the Puma can withstand much higher pressure than the Win 94. I would think that if the 92 is manufactured in .454 Casull, then your problems are solved.