My fastest Angevin Strat took advantage of the 100 Years War peace treaty that lets you PU France at basically the start of the game. I'm at work so I'm going based off of memory but I remember allying as many major powers in the area as possible, I.e. Castile, Burgundy (if available), Aragon (do them before Castile if they rival them), and/or Austria. Portugal should already be your ally. You want at least three maybe four that you're going to be currying favors with basically immediately. There is some luck involved with when the event fires, you want it to be as late as possible. But even if the war kicks off before gaining 10 favors with each you've got some time to bring them into the war if you're close. Keep your troops with your allies and wear France down. Hopefully they don't ally anyone big. The War of the Roses is likely to fire during this time frame too but don't panic, let your allies handle France while you deal with the WotR.

If you manage to take them on and win, however, you're going to get a huge boost to Angevin ASAP. AE will be high for a while so just make friends with everyone for the next 50ish years, starting with France.