Ok … There are products on the market for key makers that solve the remote part of a key … They still need to code a transponder and cut a blade but for the remote open/close there are produtcs that can emulate/generate a new remote on a board that is then placed on the replacement keyfob … there are even comercial machines they sall to key cutting houses so that they earn money and the guy that cuts the key can have a remote replacement. Works like this :
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Guy at the shop cuts the key and programm the immobilizer transponder by normal way, they just need to have a working remote without the need of having a huge stock of blanks for each different brand.
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They use this sollution that have a generic case and PCB for all cars, they move the key blade and transponder (Hitag 2) to this case, the PCB is programmable by app on phone to generate a virtual remote for a supported car and then this is added to the car …
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IF flipper does know the protocol for a specific car it can be done with flipper without issue …
Would work like a keeloq …
One would generate a new remote in flipper for a specific car that flipper would be aware of and then one would add that to the car / programm that on the car and it would work ,
Easy alternative would be intercept signal on air as re-programming of new virtual command remote would not be necessary …
Another example :
