In Thailand LED are not standard across the Turbo models.. It's only on top of the line RS.. same in US where there are many trims under Turbo.. LED is only on top of the line Touring.. LED is not available as option.
Also the Full digital TFT display has compatibility/functional connectivity with Apple Car Play and Android Auto unit.. PKDM don't have it so cluster is missing as well. The full TFT is available only in Civics where there is ACP/AA compatible head unit. This also result in less functions on steering wheel controls which you missed it.
In your post you mentioned Audi , BMW and Mercedes running on 87 without any problems and same will be Case with turbo Civic , But your point #2 still asks Atlas to tweak ECU for 87.. ?
There are many other small features like missing auto dimming rear view mirror which is standard on USDM.. As per one of our member there is no power driver seat on PKDM Turbo while it's there everywhere else.
Dual zone climate control unit is missing as well. So I believe although LED make car looks much better but I will stress on convenience feature more.
In refrence to the post by @dawar