All by all not a very clever idea since especially the ones below the dash are difficult to access.
We had 2 choices, wait to build in the units until the firmware is stable, or , find an easy update path.
It was an easy choice to add a DB 15 connector to the side panel of the housing to bring the 2 JTAG ports out.
Unfortunately it also means that we need also a double flat cable from JTAG headers to the DB connector.
Luckily Nancy broadens her horizons and became in no time handy with a soldering iron what resulted in 8 sets of upgrade kits in a more then reasonable time.
Only some epoxy is now needed to immortalize the cables set before our rework is finished.