Maybe I'm missing something, but can't we just create a very simple drone that only carries UAV version of TRG-300? I'm thinking about something like the FAB thing. The drones in question wouldn't even need to be that different than the current ones. Just a modified fuselage to carry one missile, and an engine good enough to climb up and loiter at relatively high altitude. No gimbals, no fancy sensors. Built to operate in non-contested airspace from way behind the lines. Data transfer and network capabillity would be the only hurdle we have to overcome before building this in my estimation.
I think that's a good concept for massed stand-off strike. 30-40 of those working round the clock and you can get an insane level of tempo for the strikes. And for the record I also think that kind of aircraft should be used to carry smaller, more numerous missiles or loitering munitions.