Bus boarding option for aircraft with onboard stairs

Sooner or later we will have passenger airliners with onboard stairs, official, third party or mods, that cannot use neither the jetway nor the boarding ramp.

Planes such as: the Sud-Aviation Caravelle, the Dassault Mercure, the Douglas DC9 and MD80, the Boeing 727 and 737 (early), the de Havilland Dash8, the Fokker F27 and F100, … and many more, including most Business Jets.

So, maybe Asobo could add an Airport Bus alternative. Like a small VIP Bus for Biz Jets and a large “Bendy” Bus for the Airliners.

New services could look like this:

[SERVICES]

FUELTRUCK = 1
BAGGAGE_LOADER = 1
CATERING_TRUCK = 0
BOARDING_RAMP = 0
BOARDING_BUS_SMALL = 0 < NEW !
BOARDING_BUS_LARGE = 0 < NEW !
GROUND_POWER_UNIT = 0
PUSHBACK = 0
SMALL_PUSHBACK = 1
MARSHALLER = 1
JETWAY = 0

Just to be clear, I am only suggesting boarding buses here, without any animated passengers.

I already made a Zendesk request.