Another parent of a child (adult now) with epilepsy here and sorry but you are using your imagination without any real understanding.
If I take my daughter to her social club in the car it takes 10 minutes as opposed to an hour getting two buses and the waiting at bus stops and getting to and from the bus stops. That's a 10 minute window for a seizure rather than an hour.
The club lasts for 3 hours - i have plenty of time to go home and do chores and then go back and pick her up In the car. If I had to get the bus back home then go back and pick her up, I would be spending 4 hours travelling per day. That's not a reasonable use of time.
But also, have you seen someone have a seizure in public? A lot of people find it extremely distressing. And of course the bus has to be stopped until emergency services arrive. They won't let the mother deal with it herself - the driver will call and ambulance. And if the person having the seizure has wet themselves, the bus will be out of service. I'm sure you wouldn't want the inconvenience.
If you are used to your child having seizures, a seizure in the car is no particularly big deal. You know what to do and are in familiar, comfortable surroundings. It is much harder to deal with in public, with anxious passers by and people trying to help.
Why not let those of us with direct experience tell you what we need.