If you spend hundreds of hours with a custom keyboard / layout but then have to switch for 10 hours every couple of months I doubt you'll be feel at home during

If you spend hundreds of hours with a custom keyboard / layout but then have to switch for 10 hours every couple of months I doubt you'll be feel at home during those 10 hours and I doubt you'll be productive. As someone with literally decades of experience with alternative keyboard designs and character layouts, I can assure you that your fears are ridiculous. It's not in any way a problem to go from, say, a Kinesis or Ergodox running Dvorak back to a QWERTY laptop for a day. You wildly underestimate the human mind and body. Now, learning Dvorak or Colemak after years of QWERTY, that is difficult. Going back, however, is easy.