Right, so my plan was to level the various beds using the good old fashioned manual way. 

Now, because 

• 3D reliability is actually really important, 
• I want to further flex-tape my features, 
  • (bragging rights if this isn't a standard feature by the time SecSavr is working)
• the beds are planned to be swapped out often,
• some bed segment orientations would make accessibility difficult,
• the max supported bed segments would technically be 6, thus 12 levelling points, and
• the W axis needs to be very accurate or taller 5-axis parts could be out of alignment,

I am going to start looking into an automated bed levelling solution. Maybe automated bed tramming is the word? I'm talking about the bed moving to make sure its surface normal is aligned with the main Z axis.

I'm assuming I'll be using a multiplexer to make this happen. It's not like the electronic levelling has to be particularly fast. It still would likely be faster than me doing it.