Try this :) it popped up on Google pretty quickly --> http://www.hobbytronics.co.uk/schottky-logic-level-conversion
: awesome. done. added to spec.
Same problem - access to the 3.3V power line inside the EOMA needed.
Anyway - 3rd diagram added - modified version of Henrik's diagram for the EOMA: http://www.gplsquared.com/eoma_boot/eoma_boot.html#uart_repair