So guys, I think since we don't know when the next arkhamverse game is set. Let's talk a bit about the Ra's al Ghul choice.
So I'll start with my opinion on the matter:
It depends when you want to approach the mission:
- If you do during the main story, then destroying the machine should be...
If you want i think it's possibile to make It work. As of here I'm counting only things that directly crossed over, Like the Whedonverse with the Alien x Buffy crossover.
it can work as Angel Season 5 is set in 2003-2004.
and def before, The firther Season 5 can get is May 2004.
AVP is set During Angel Season 6, well the reminder of it after the reset. So basically in the new timeline created after "After the Fall".
in the purpose to give exact years I would lean with the IDW Transformers dates. TF already modified the years and passage of time of the G. I. Joe run, so in the purpose of connecting the 2 I guess they take precedence.
I do really want to see a Earth-7642 timeline since that universe could or could not be the same universe as IDW Transformers (i lean more on not be, but it can be interesting tbh).