Yes no problem, although worth looking for CW or F rather than WT+.
No possibility of F to BWI (it's a 3-class 788).
I think it's more likely that availability will open up in CW rather than WT+. But in the unlikely event WT+ becomes available, then (for various complicated reasons) I will probably need to go with the cheaper option (saving 24,000 Avios total plus £43 per person).