Club here uses MySky to controltheir Meades from a laptop, so would expect the LX90 to be the same.
They do the imitial "alignment" via the handset, but the alignment is very much a case of synching the scope to a star - the scopes sit on an accurately aligned mount and get location and time from GPS.
Once aligned the control is taken by the laptop and MySky software.
I assume that some alignment data is held in the handset so maintaining a handset is required. So if the idea is no handset it may not be an option. At present I think only Celestron and Skysafari may be capable of running without a handset and maybe not all Celestrons.
From a somewaht vague memory the laptop plugs into the Aux port, something says not the handset - but high chance of being wrong.
One catch is the arrangement is OK if there are mains power outlets otherwise laptops, batteries etc drain fast.
Sudenly unsure of the software name - is it MySky or TheSky.
Does at times seem a bit strange that manufacturers have not issued a software version of their handsets to run on a PC/laptop then direct to the scope, so negating the need for a handset.