I know of no off-the-shelf OBDII dongles that will work in the Roadster, or pretty much any EV for that matter. The dongles just don't know how to deal with the lack of combustion, and the Roadster doesn't provide any OBDII-standard communication on the connector at all. It's also highly unlikely that they have a special device for the Roadster's diagnostic port.I would like to use a pay-as-you-drive insurance service, but that requires plugging in an OBD-II dongle
The OVMS v3 module can provide an OBDII standard-ish port, derived from information on the Diagnostic connector, but since it's an emulated service I suspect the insurance company won't (or, rather, shouldn't) accept it. For example, by default it's pretty good, but with scripts one can output pretty much anything they want (e.g. report 50% of the mileage). But if there is proper disclosure and you both accept the conditions (no funny business), you might give it a try. I would strongly suggest not trying to get away with it without disclosing what you're doing, because as a hobbyist product without the legal underpinning that no doubt is associated with the OBDII connector, it could give them an "out" to deny coverage in the event of a claim.