If ICAO DOC 4444 Chapter 7 can be met then what is the problem with "Remote" towers?
"7.1.1.2 Aerodrome controllers shall maintain a continuous watch on all flight operations on and in the vicinity of
an aerodrome as well as vehicles and personnel on the manoeuvring area. Watch shall be maintained by visual
observation, augmented in low visibility conditions by an ATS surveillance system when available. Traffic shall be
controlled in accordance with the procedures set forth herein and all applicable traffic rules specified by the appropriate
ATS authority. If there are other aerodromes within a control zone, traffic at all aerodromes within such a zone shall be
coordinated so that traffic circuits do not conflict"