Did you ever port LukaV2Eng to the V4SoftEng?
Is exactly the same proccess
You have to change the .ddb and .ddi files of the V5 in cuestion with the ones of a random voice
And voila, you can use V5 in V4
Example, Mikoto in V4: https://clyp.it/tzwslsft
That is not what i meant. I meant adding them as separate entries, in a similiar way to how the "Sora for V4" and "Ken for V4" installers do. I can do such a thing for Vocaloid 2 to Vocaloid 5, but i can't manage to figure out the correct things to edit in the registry to do something like that for Vocaloid 5 in Vocaloid 4.