This is an interesting conversations, Ive seen LPG conversions online that costs about £1000.
Electric conversions probably costs about £5000 as a minimum – although I believe with creating a production line and making the car range extended with a generator will make the project viable everywhere. The generator can also be then used to power the home when there is power outages.
If lpg can save money and return on investments is shortened perhaps it should not be dismissed, there are conversations about it helping it clean the engine (I think this is true for diesels) – Im thinking trucks – but again my argument for this will be range extended electric truck, simplified lower maintenance more reliable.
Anyways here is a company that could be potentially partnered with to do the conversions: