I don't think we have Crossbow in Canada. Will have to check the new Blue book.
Remedy is the agricultural name for Garlon4 and already has some 24D in it(many sprays do...it helps the other chemical enter the plant) as well as a kerosene base.
Quite frankly Remedy is a very expensive weed killer. In that $50/acre range. GrazeOn would be about $28 and Restore around $18?
I do a lot of industrial spraying(pipelines/well sites) and the preferred spray is now Milestone. Probably the lowest environmental impact of any industrial spray. a lower LD number than Roundup, doesn't move, breaks down very rapidly, and is cost effective.
For leafy spurge Tordon 22K is the best product but again very expensive and has environmental issues.
In the USA farmers have no problem getting just about any product...not so in Canada...you need an industrial licence to get Milestone or 22K.