I believe that steam is of no use for the games with some visibility.
Just take a look at most of the cracks you can find, it replaces a steam ddl and an ini file and it's probably standardized.
So that may be efficient only if your game doesn't get known (so nobody will crack it). If you get a correct visibility, one of the cracking team will take some time to crack your game and you'll stay in the 99% piracy rate.
It is only my point of view and I wish you the best but I think it is better to warn you
And why not making à good old demo version ?