Oh I got that, I was just waffling with additional stuff,. Yes, dalaran would be an option, as would doing something a bit closer to the night elf highborne. My order of preference would be
1. Silvermoon aesthetic - its gorgeous ti was designed for the high elves - I wouldn't want the alliance half the race suddenly "not allowed to have it or build that way because the horde ones have it htat way.. to me that's silly reason. And while I like diversity and variation, so if possible they should give something else, I think it's altogether un-necessary, it's the style of the people, I belong son both blood elf and high elf. Just like how I feel Suramar, Zin'Azshari that's night elf stuff, and it belong on both Nightborne and Night elf.
2. My 2nd choise would be Skywall. Simply because it's breath-taking, has the lofty feel to it, with the colour schemes etc. A ground version is what I had imagined, , don't think high elves should be in the air or in another plane for that matter, even if Dalaran is.
3. Dalaran - It's not as nice as the first 2, but canonically a lot of high elves live there, it's halfway between the high elf and human stuff, Although imo, if hey were to do half elves as a thing, Darlan instead of Stormwind would be perfect for their home. Regardless of the city being neutral or not. I see no reason why an entire city used by both factions has to suddenly go one faction because the main race in it goes to that faction. I t can do, but it doesn't have to stop being what it is about.
4. Some halfway to Highborne architecture - this would be my last choice, because I think the Thalassian and night elves should have the degree of separation that they already have just the way things are, and the current sets have just enough similarity for you to recognise them both as elven albeit different styles of elven, whiles I can easily see some of my NElf fans welcoming this for greater high/night elf relationships. Now if the High elves were to move in with the night elves in a a rebuilt kaldorei city - with the pristine version of this night elf architecture, than fine, that has an appeal to it. Making it the high elf architecture not so much, some fusion between the two like you suggest would be more preferable, but not as preferred to me as option 1. or 2.
These are ofc my opinions and my preferences, quite understandable if you have another, and prefer something else. In the past I would argue that my choice was best, but then I gained a little wisdom and realised, that was only true for me, and that others because they were different would have different preferences and likes.
These days I am not trying to force people to agree with my choices preferences or likes, Id o like sharing them and talking about them, going into detail about why like them so. But I take the same approach to other things. When I realise something, and it comes up in conversation, I like to say, and if I feel people don't get it, I am alwayshappy to explain how or why I got there.