Give it up. It never worked. If it had, it would be in. They took it out, because it worked oh so well. 
Oh so well.
At this, the 11th hour of Classic release, you want to stop, and put in something they couldn’t get to work. Clearly, the OP had not thought this through, at all. Additionally, they point out that Classic will not stand or succeed without modern graphics. Yup, there’s no appeal for Classic, like what-so-ever. All this time, it’s been BfA gamers have been clamoring for.
Right back atcha.