Abstract: it is too expensive and there are good, cheaper alternatives.
All the Mage2.PRO extensions are compatible with localhost environments, but I do not debug such installations for third-party developers.
Technicaly, it is possible via technologies like Remote Desktop Protocol.
But it is too expensive: every debug debug session would take 1-2-3 hours of my time.
The localhosts installations are not intended for clients, but for developers: the persons who should have the proper professional skills to debug their local installation themself.
So the solution for clients is simple: if your developer is unable to debug his own localhost, it is cheaper for you fire him and hire another, more skilled developer, than to pay somebody to debug the developer’s localhost.