I have a 1x7 drivetrain on my commuting bike and am very happy with it.
Easiest thing for you to do is remove the inner and outer chainring from your current crankset; the middle chainring is probably lined up fairly well with the rear gears already.
You could leave the front derailer on the bike and just move the adjustment screws so it stays in place around the middle chainring, to keep the chain from dropping. But you're likely fine without it.

If your crankset has chainrings riveted on, then you might want to switch to a different crankset.

I use a guard in place of the outer chainring, so shoelaces don't get in the chain. But again, this is my commuting bike that I ride with everyday clothing.