I imagine they figured that out when they designed GLSBD to be compatible with HIMARS/M270 launchers.
Presumably, but I've never seen how it was handled. I suspect for testing purposes the glide bomb got preprogrammed somehow; I wouldn't think HIMARS would have the software or physical connections to interface with the SDB in the tube. But presumably however they handled it could be translated to the field, even if it was inconvenient. The Excaliburs get fused apparently with a hand held device since the canons provided don't have a built in wireless fuse setter like M109A7.
That handheld device is the same one used for all modern electronic fuses.
From the GPS Excalibur and PGK, to the simple Go boom in X time uses the new Enhanced Portable Inductive Artillery Fuze Setter to do it.
Standardization is fun like that.
In all likelihood hood the GLSDB gotten a modification, somewhere either physically or Coding, to enable it to talk.
Especially since those Pallets are sealed at the factory and you cant get in unless at the factory or after its fired. And it handles all the shipping and connecting needs with one cable.
Its literally a load up on launcher, lock it in, plug one cable into launcher to connect it and you off.
Thats it.
Thats how you make a M270 type MLRS ready to fire.
The rest is load up the target coordinates with the truck militrope and driving to a spot within range.
If Boeing and SAAB did their jobs, and they had to get the thing certified which it is...
It work just fine.
At most you might need to flip a setting or charge tge harddrive with one that has the new stuff on it. Which is, basically like changing a USB drive.
That is legitimately the worse case, as in Boeing SAAB lied about everything bout the GLSDB, scenerio.
A 1 minute fix.
It longer to full the truck up with fuel then it be to mod it for GLSBD launch.