well you could go with a tremol-no, but it'd be pretty overkill on a regular strat bridge it's more intended for Floyd Roses and stuff.
http://www.allparts.com/Tremol-No-Products-s/273.htm?Click=8173
or you could buy a Hipshot Tremolo Adapter Block, paint it to match your guitar, and throw a hardtail strat bridge or tune-o-matic and stopbar or really whatever kinda bridge you wanted on there.
http://www.guitarpartsresource.com/bridges_hipshottrilogy.htm
However, if you have woodworking skills you could just make your own for prolly a lot cheaper. Also, they are designed to fit USA strats, so if yours isn't one it might take some sanding to make it fit. I have no wood working skills so I've considered this option many times, but haven't actually decided if I want to.
Also, there used to be a company called Custom Shop Parts that made these:

They also made more conventional looking ones that looked like this:

However, I believe the company has gone out of business as I can no longer find any of their stuff. However, with some internet searching you might be able to find something on ebay or something.
Best of luck. 😁