Probably worth a shot.
I have propagated blackberries by bending over and burying the mid section of a cane. Next season I cut the cane and I’m left with two plants.
I’ve also used root cuttings from blackberries in large containers. Sometimes by properly taking cuttings and placing them in the fridge with peat (IIRC). Sometimes, I leave the large container with no plate under it in one place for months, then just come along and move the container, breaking off and leaving behind the portions of the roots that snuck through the drain hole into the ground.
I’ve had no luck with blueberries, unfortunately, as I want a bunch of those to use as hedges.
I saw the niftiest grape propagation method ever: google two-liter grape propagation. I reckon it would work on anything able to send roots along the branches or canes.