One feature of the copy command under DOS/Windows command line is that you can specify a second (and a third and so on) file and append it to the first one when writing to a destination by specifying “copy first.file + second.file destination.file”. The “+” plus sign there before the second file signifies that.
And as .obj files are just ASCII text you combine a file with the object geometry with a prepared second one that just contains the UVs to one that now has geometry and UVs.
Via batch script you can then have the whole process repeated for every object (each in its own separate file though).
Just basic old-time DOS file operations really.