Rather than a soaker hose, you could probably just fill it with water. If you have some bleeder hoses drilled about an inch up once in a while, excess water should drain out. The remaining water will eventually wick upward.
iI was painted to protect it from the sun. we are zone 7 I don't know if the roots will make it through the winter with such little protection. I have had pvc laying around outside now for seven years at my current place. It was leftovers from who knows where, then it was horse jumps and cavalettis, it has been temporary drain pipes and electric fence posts. I've hacked odd pieces for cheese presses and for various projects. There was one that apparently rolled into the creek at some time and I found it when the goats cleared the area recently, still intact. It has lasted well. The strawberry tube was built this spring. we shall see! so far this is the only strawberry planting I haven't seen not over run with bermuda (locally). Any perrenial stuff is a PIA here.
It really got my brain going! So many possibilities with shapes! now (along with all the other projects floating in my head) when I drive around and notice peoples "junk" I always try to determine if it would make a good stawberry planter.