Champagne just happens to be the first in that set of events, but I was talking about all of them. I was at war with France just about every 5 years or so during the 15th century until I dismembered them in 1475...however I lost all of my cores on France in 1447 because there was a year span where I wasn't at war and we'd hid the point where we'd decided that England needed to have decisively won the war by. I don't really see how it makes sense to say I'd never recover any of those French provinces when I managed to do so within the next two decades. (I even did so using the York leader that you get in the ahistorical path of the WotR where the Lancastrians win and in the event about the heirs of the York it mentions that you might use them to go a conquering in France.)
I don't necessarily have a good suggestion mind but just wanted to point out that it was a frustrating as a player when I'd done everything to continue the war (besides being perpetually at war which was never the case in the HYW) - including keeping Burgundy in my sphere.
The last point "keeping Burgundy in your sphere" means that the Treaty of Arras did not mess with your burgundian alliance. Then with my suggested trigger that checks the ENG-BUR alliance the event would not have happened in your game. The same trigger could be applied to every ENG event in which the lost alliance with BUR is mentioned as the reason for the lost control.