Wow this is awesome, thanks so much everyone for your responses.
Thank you in particular Anne Miller for that video of Dr Ingram. What she said along with what Faye commented here makes more sense to me and seems to line up better with other things I've been reading about. My hunch is the lower pH where "acid loving" plants thrive is a byproduct of other conditions in the soil that are also helping them such as higher water throughput, frequently replenished decomposing organic matter, and microorganisms that are producing acid.
Regarding some of the other things that were brought up:
Nothing much is currently growing in the strip of soil I originally asked about and I don't know a whole lot else about it yet either. I was a bit vague about it and what I was trying to grow on purpose even though I knew the advice would be less specific because I'm trying to consider different setups right now (more of a "what if" that I could apply to different possibilities).
I'm in Colorado and there are lots of dry periods and our soil and tap water is alkaline so I don't expect that anything I add in an attempt to lower pH would be permanent because over time repeated applications of tap water and/or those natural conditions are going to return. What I am hoping to be able to do is to use things that are already in my waste stream to slowly and repeatedly apply to lower pH, with the assumption that if it works it will only keep working as long as I keep doing that.
I am actually attempting to grow blueberries but that was not the scenario I was originally asking about. The blueberries are in peat moss in isolated containers from the rest of the soil. I was originally planning on just following the guidance from the Colorado State University extension which essentially involves regular applications of acid to counteract the slow pH increase caused by watering. However, after absorbing the information in this thread further, I'm going to abandon the idea I originally asked about (for now) and see if I can apply some of these ideas to my blueberries instead.
My plan now is to take any waste products I have that are naturally high in acid or sulphur - for example, onions, tomato, raw fish, and bury small amounts 3-6 inches deep (poke a hole and drop in) about once per week to each plant. Luckily I have two of each of different varieties to test on so if I track what I add and test pH regularly, I will be able to report back in a few months to a year whether those plants are did better/worse or maintained soil pH any differently than the ones which just got standard compost and acid treatments.