If I did, I'd probably have to do an Earth-203 Birds of Prey timeline too. There's way more linking Earth-203 than Earth-L&C.
-Same Arkham Asylum.
-Same Batsuit.
-Same Batgirl suit (different character though).
-Same Catwoman suit.
-The teaser used footage from Batman 1989-1992.
-The TV guide for the series had an apparition of Keaton's Batman and Pfeiffer's Catwoman.
Though, I'd note that on Earth-203, Bruce went through Dick Grayson, Jason Todd, Tim Drake and Barbara Gordon as sidekicks. Also, that definitely ain't Jack Nicholson.
I can't remember there being any years but I'd default to 2002-2003. That'd place the Batman/Catwoman timeline a lot further back than in the Burtonverse.
Probably 1979 and 1982 for the events of the Burton films