Completely de-hybriding one would be major surgery. For one, you'd need to figure out how to bolt on an alternator, Then, if I'm not mistaken, the electric motor, clutch, & flywheel are pretty much an integrated unit. The motor also acts as a dynamic balancer for the engine. Then there are all sorts of possible interactions between the IMA system and the engine ECU...
FWIW, my experience of driving with limited battery (that is, when I've put off rebalancing for a bit too long) is about 5-10 mpg less (from mid-70s in good conditions to mid-60s), poor acceleration, and minor inconveniences like the DC-DC converter cutting out.
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