OK I think I know pretty much every route to get from the Disney area to Universal avoiding I-4.First of all if you're staying on 192 you can also get inside Disney property by taking Sherberth rd,this is a true shortcut as this is a very nondescript entrance that is pretty much a service road,you enter Disney property by AK on Osceola pkwy,I love going this way since the traffic on Osceola is pretty good and moves fairly fast.Another thing is that from those western areas of 192 it's pretty far to Universal and these are only options to get you there but are not likely to be faster than I-4.Here are the options.
1.Enter Sherberth rd from 192, go east on Osceola pkwy,turn left on Victory way,turn right on Buena Vista dr.Get on Epcot Center Dr/World Center dr (536) going east,basically the opposite way of Epcot,take that past 535,you'll see the Caribe Royale on your left and International Drive will be just past the 535 and the Caribe Royale,turn left on International drive and go past Sea World and right after you pass the Convention center you'll see Pointe Plaza ave,turn right on it and then turn left on Universal Blvd and follow it to the park.You could stay on International Drive instead of turning on Pointe Plaza but you will get more traffic on I-Drive.If you do take I-Drive you will eventually hit Universal blvd again,turn left.
2.Enter Sherberth rd from 192, go east on Osceola pkwy,turn left on Victory way,turn right on Buena Vista dr,turn left on Bonnet Creek pkwy,then right on Vista Blvd,then right on Winter Garden Vineland rd,then left on Apopka Vineland rd and take that all the way to W Sand Lake rd,you'll go through Orlando's Restaurant row,turn left on Turkey lake rd and then right on Hollywood way straight to Universal parking.Instead of taking Bonnet creek pkwy and Vista you could also go strainght on Buena vista dr to Hotel plaza blvd and turn left on Apopka Vineland rd,but of course more traffic that way.
3.Option 3 you'll be doing the same thing as option 2 to reach Apopka Vineland rd,you could go either way, Bonnet Creek to Vista and then Winter garden Vineland rd or Buena vista to Hotel Plaza blvd.If you take Hotel Plaza blvd you would turn left on Apopka Vineland rd and then turn right on Palm pkwy which becomes Turkey Lake rd take that all the way to Hollywood way to Universal parking.If you go Bonnet Creek to Vista blvd to Winter Garden Vineland rd,Winter Garden Vineland rd becomes Palm pkwy so you would just go straight and Palm pkwy becomes Turkey lake rd,take that to Hollywood way to Universal parking.
4.Final way and to avoid any further confusion that I've probably given you is to reach Apopka Vineland rd either way I showed you in the previous options and instead of turning left,turn right,go under the I-4 overpass and then get on the left lane and turn left on Vineland ave,this will take you by the Premium outlets and will reach International dr.Turn left on I-Drive and then follow the instructions I gave on option 1 to get to the park.Confused yet??I've gone back and forth between Universal and Disney probably hundreds of times and I usually avoid I-4 but like I said it's not exactly faster than just getting on I-4.
I will certainly try them. I prefer back routes. Most times when I look this up I always get something including I-4 which is the most direct route. Now I have options 
