I think you have misunderstood the Qt licensing model when you say that you need two Qt licenses if you are building two separate applications?
The commercial licenses are a) per developer and b) per distributed device (if you distribute your software as part of a device), there is no per application licensing requirement.
> An application using Qt Commercial must not communicate with any another application using Qt LGPL-3.0 or Qt GPL, if both applications run on the same device. This is more restrictive than GPL.
The context there is "combining commercial and free open-source Qt licenses"; if you are using either commercial or open source licenses exclusively, there are no such restrictions.
The commercial licenses are a) per developer and b) per distributed device (if you distribute your software as part of a device), there is no per application licensing requirement.