When I disabled darktempler through action like disable doodad state

I just dropped out of SC

You can't. You can give a player vision to the player owing the dark templar though. Or you could create a nit with detector.

A dark templar sprite would work, if you never want to be able to click on it or move it.

It's impossible to uncloak a dark templar without mods. As Heimdal said, you can disable the sprite unit, but it is walkable, still cloaked, and also spins in a circle.

Hallucinated dts are also visible

Uncloaking DTs was patched a while ago, can't remember when though... The only method I can think of otherwise is to use hallucinations.