Not crazy about having him appear as Quicksilver for 2 reasons.
I would have preferred the MCU version for emotional impact. Yes, I prefer the FOX version, but, as far as ties to the characters/verse? No. Now I know Marvel is trying to race to beat Warner/DC to the Multiverse (on the big screen, though I'd argue DC already has, twice, beaten them there with the arrow verse and WW 84), but I too prefer a "clean slate", especially as Jackman won't be returning. Jackman's Wolverine claws scratching across Cap's shield would have made me creame my pants, to say nothing of a Hulk flex/rage roar in the background with SNICHT in the foreground, or Cap and McKellan's Magneto sitting and having a discussion about World War 2....but, alas, those days have passed. Evans Quicksilver, while a fan favorite, came from some very poor movies in a soft reboot turned sequel and prequel and then reboot again franchise of films. A crossover could be fun, but ultimately, confusing, as insofar as I know, only Deadpool (already detached from the other Fox films and a 4th wall breaking character anyway) is planning to be utilized from the Fox verse, so, Evan's Quicksilver, well....just felt odd to me.