Have a look at
Outex, their basic version is a blue dry suit for your camera. The ports are glass, I think the DiCAPac's use plastic? Ewa-Marine has bags like the DiCApac but I think with with glass ports. The Outex has an advantage of being form fitting. It looks like they have a kickstarter for a transparent option.
I had considered the Outex for a few years for my k5iis, but a few months ago I picked up a used nikon j1 and its
deeply discounted dedicated nikon brand hard case (unfortunately not available anymore). It might be worth looking at the available cases and work backwards. There are Polaroid branded hard cases for P&S cameras (I had considered a Powershot G## model) and a few for older Sony Nex models and a Lumix micro 4/3. I know my J1 isn't the same quality as getting my k5iis underwater and none of the APS-C or smaller models will be as nice as your K1, but for me it was an inexpensive entry to underwater photography that's a step up from most of the underwater P&S models and it should help determine if I want to go whole hog with lights, fancier cases, etc.