Ribfeast,.. Where are you based ?
Several other aussie members have been through this similar situation already and could be useful contacts for you.
Swapping to salvaged GM Volt cells (imported ?). seems to be the preferred cost/benifit result,
..Though jones'es EIG cells are very tempting for performance !.
Read this thread from Galderdi (Brisbane based)..
.. Battery discussion seems to start on the 2nd page..
Note also input from Kwiev (Jindabine) who did a similar swap on his buggy.
I believe both bought imported cells ,..so its not too difficult.
Use the "pm contact" function to talk to them off line if you prefer.