I have soaker hose on my rain barrels as well with a 2 foot drop giving a fraction of a PSI of pressure and it works great! I use the soaker hose that is a course rubber instead of having holes in it so the water seeps out.
I also have a mechanical timer that works well, but I tend to leave the soaker hose on over night, a single stretch of it empties out 100 gallons over the course of 6-8 hours, so not very fast but enough to keep the soil moist.
If you have a lot of trees, then the heads that you install in a larger soaker hose seems like the way to go, that way you get a head or two next to each tree.
Bottom line is, what you are wanting to do has been done and it works well with off the shelf stuff.
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