I'm not exactly sure what is so expensive on LOTR that would make it's BOM that much higher than IM. Both have 2 ramps, two flippers, magnets, plastic set, spinners, molded figures, motor, etc. What is the high cost item on LOTR that would make it so much higher? I don't see it.
Now the Whitestar thing might be a bigger obstacle...it would take somebody probably months to get that code working right on the SAM system. They'd probably just reengineer the whitestar board for any parts no longer available, would be the easier path. And for those that say "that's impossible, they're done with that" well that's just crap, they've done it a bunch of times before. Whitestar was out of production for 3 years before they did LOTR LE.