I'm not certain, but if there are 3 spaces in between the villager plot and Town Hall, I don't see why it wouldn't work. It's been a while, but I had both Monty and Hazel plot pretty close behind my Town Hall before I learned about plot resetting, but they were each slightly off to one side.
I'm not totally familiar with trying to get a villager to move into one specific spot as I have yet to try it myself, so keep that in mind... but I think a villager could move into that spot. I've read a couple people claim they've had villagers move as close as two tiles from the side/back of the town hall building, and there's a space between the plot and the pond as well so I don't think that should be an issue, either.
I can't confirm this from personal experience, so sorry that I'm not 100% certain, but I hope that was helpful in some way! ^^
An excellent piece of advice that dizzy bone has said before, try building a fountain there. The fountain is the same 3x3 area of a villagers house. Plus the fountain is one of those PWPs you already have unlocked. Due to it being so close behind town hall, I would say put it one lower than your house plot to see if it can get built there. I don't see why not, as I have had Dotty plot like 2 tiles away from town hall.