What size weeds are we talking about?
MCPA and 2,4D will be cheaper and hit a lot faster. If you use leystar etc then you are relying on the florasulam component (IIRC) which will be a very very slow kill compared to MCPA or similar.
Yes, that what I’m saying.
Docks and other perennials in what will be a 10 year ley were reason for using leystar.