If you are referring if it's possible to disable cold start by coding only i would say no, the changes are made to engine ecu and therefore it needs a piggyback or reflash as you stated above.
Sounds a little fishy for having already spent 1600$ and needing to pay that much more for changes.. Might be more understandable if long time has passed since the initial purchase.
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G30 520d xDrive - 2017
Retrofits: 3AG - 609 - 688 - 6WB - SLI
F22 218dA (2015)
Retrofits: None
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