11 to 12 speed

I’m running a 2017 Vitus Escarpe VRX with full 11sp XT

What’s the most cost effective way of converting to Shimano 12sp using as many existing parts as possible?
Giant TCR Composite 1, Giant Defy Advanced 2, Boardman Comp, Santa Cruz Heckler, Raleigh M-Trax Ti, Strida LT, Giant Halfway

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