Low Power Timer That Becomes Dead Short at Intervals
Your question is rather garbled. 


  I want a component that accepts 5V at 1W, and acts as a low power (&lt;&lt;1mA drawn).


A component that draws 1 mA at 5 V will have a power consumption of 5 x 1m = 5 mW. What does 1 W have to do with it?


  Any solution should behave conceptually the same at 12 V or 10 W, etc.


You have the same confusion in this statement.

If you edit your question to explain the purpose of your proposed device you may get more helpful answers. Otherwise your question is likely to be closed as "unclear what you are asking".