Whiskey Lake is supposed to have hardware fixes for Meltdown and L1TF, which should boost performance and battery life.
(Edit: CPU for the 17" is Whiskey Lake, the others appear to be Kaby Lake Refresh, e.g. LG Gram 13.3: https://www.lg.com/us/support/products/documents/13Z980-A.AA...
No info on key travel)
Might there be a vPro configuration with a TPM, for running QubesOS?