It might be worth it for convenience, especially if you charge at home often. Portable chargers usually cost around $200-$400, depending on the brand and features.
Have you considered how long you’d be without your car if you call roadside assistance, or would it be quicker to try using the sealant to get to a repair shop?
Hey! Yes, you can remove the antenna from your La Prima, though it may depend on the type of antenna it is, you should be able to unscrew it, but double-check the manual just in case..
For TomTom Live, it may need activation through your Fiat account. The buttons under the charging flap and boot hatch could be for service features or emergency functions.