There are enough keys to fill a Preonic if you take the Value and the Preserving kit. Use the keys from the navigation cluster and arrows as well. You have several different options for the bottom row since the Value kit is quite big and generous (notice there are 7 1u bottom row keys)
yeah, sorry, I wasn't clear at all. My bad. My concern isn't the bottom rows; you're right that I'm totally covered there. The concern is R2/R3 - there seem to be limited options. Below is how I guess I would lay it out.
left side top to bottom:
R1: 1u escape from value (ro from value if escape on R2)
R2: 1u escape from preserving? (I usually prefer tab here, but that's me; I know a lot of folks have esc on R3). What are my other options?
R3: 1u tab from preserving I guess?
R4: 1u shift from preserving
R4: 1u control from value
right side top to bottom:
R1: a lot of options, e.g,. 1u delete from value; 1u bksp from clarity.
R2: ?? rendaku key from value?
R3: 1u mu key from value?
R4: 1u enter key from preserving
R4: 1u right arrow from value.