Ok, so in order to use an HS2 card who depends on a .ZIPMOD for specific head model, you need to change 2 specific values written in 2 specific files, both contained in the .ZIPMOD.
1: change the "game" value in "manifest.xml.
-Open the zipmod with your archive tool of choice, 7zip, winrar, it doesn't seem to matter. I have Winrar so I used that.
-In there you have an "abdata" folder and a "manifest.xml" file. Extract the files to work on them more conveniently.
-edit "manifest.xml with your text editor of choice, like Notepad++.
-You will find a line with either <game>Honey Select2</game> or <game>Hs2</game>
-Change it to <game>AI Girl</game> or delete the line completely.
2: change the .dll library choice in head.unity3d
-open the "abdata" folder mentioned earlier, then "chara", and any eventual subfolder to reach the last folder containing a few ".unity3d" files. Or use Ctrl+F and look for "head".
-Run the program "SB3Utility GUI" that you can find in the "[MODDING] Tools" folder. You can also run it through the KKManager by selecting "start" atop and selecting the SB3Utility in the drop down menu.
Finally, if you didn't download the BRepack and just don't have it, google it and you'll find its Github page.
-Drop that "head.unity3d" file in the SB3Utility "files" window on the left.
-double click on "p_cf_head_00" under "Animator" on the left.
-click the "+" beside "p_cf_head_00" under "Object Tree" in the middle.
-Double click the line that mentions "[FaceBlendShape].
-At the line "Assembly", replace "IL.dll" by "Assembly-CSharp.dll"
-Go back on the left panel and click "File"/"Save.unity3d" or just hit Ctrl+S.
-Delete the "head.bak0.unit-y3d", you don't need that one, it's a backup of the old head file you just modified.
3: replace the files in the .ZIPMOD by the ones you modified
-Go back to your .ZIPMOD files opened with your archive tool
-Delete "manifest.xml" and "head.unity3d" from it.
-Drag and drop the "manifest.xml" and "head.unity3d" (not the backup) into the archive.
And that should be everything. That lets you use all those character mods made by Cunihinx with AI Shoujo for example.
If instead you want to use your AI shoujo waifu with HS2, then do the opposite and replace <game>AI Girl</game> by <game>Honey Select2</game> or <game>Hs2</game>, and "Assembly-CSharp.dll" by "IL.dll".
Credit to
gretaq and
ErosInteractive-PATHOS for their posts talking about this. I just broke it down essentially.
Feel free to hit them up and not me if you have further questions.
No just kidding.
...Unless?