On the surface it does look like they are packaging as a commodity something that is freely available elsewhere and aiming it at tourists.
It might be a good experience fort you but I think it would be better to do retreats as a layman at places like those you've already mention, Wat pah nanachat, or Wat Suan mokh.
I don't think there is much point thinking about a temporary ordination unless you've found a monastery or teacher and want to spend more time there.