I'd recommend checking out the Unearthed Aracana that covered "modern magic":Has anybody out there attempted anything like this? I'm trying to mix things up for my group and so my idea is to do a sort-of Rifts-style approach where the PC's are transported to Eberron from various planes/worlds/etc and reskin races & classes to suit appropriately.

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And if you're willing to spend a little money, this D&D 5E-compatible book will expand your options considerably:
DriveThruRPG
