My apologies. I didn't realize that Bâshrat the Sneaky had handed it over to you or just dropped it into your lap.
I have been off the forum for some time after a serious car accident (not my fault).
Please do not feel offended or angry, quite simply, I did not know.
I will try and help anyway I can with this SP3 thing.
Believe me, everybody is grateful for all work put into this project and I commend you for taking on a almost thankless task.
Anyway, this is what I have so far:
KB888111 must work with SP3 as I have been able to run it after a full SP3 slipstream with Driverpacks installed.
The Realtek sound driver loads just fine afterwards and I assume that other Hi-Def sound cards will as well.
Can you create a version of the Base that loads KB888111 even if it does NOT find SP1, SP2. (remove the KB888111 ver. check)
During a Driverpack integration, a warning comes up and says that SP1 or SP2 is not installed so KB888111 will NOT be slipstreamed.
I can test very easily at the moment as I have a PC on the bench that has Realtek Hi-Def.