Amazing how off track a thread can become but anyway for those willing to read or able to read [for those I post pictures] here is an item about F-35B engine change plans aboard L class ships - I'll guess the USN have been on to this for some time also:
Carrier Analysis Lab Plots Jet Engine Change on L-Class Ships
11 Jan 2011 NAWCAD Lakehurst Public Affairs
Carrier Analysis Lab Plots Jet Engine Change on L-Class Ships | NAVAIR - U.S. Navy Naval Air Systems Command - Navy and Marine Corps Aviation Research, Development, Acquisition, Test and Evaluation