I had a collie X that developed epilepsy at 2 years old till he died at 14.
No idea what could trigger one but keeping him calm and avoiding loud unexpected noises that spooked him helped.
We couldn't take him anywhere because when we took him outside he took a fit, but he was more than happy playing in the back garden and lived a healthy happy lfe, albeit different from normal.
You just have to be careful when he is in one that there are no stairs or things he could injure himself on and when he is in one, leave him alone (but watch him) till he comes out of it, then make sure he has plenty of water readily avaliable.
Medication can help greatly.
Remember they are not in pain, they know nothing of what is happeneing but it is distressing for the owner and epilepsy will not kill him.
Your dog seems mild, when mine took an attack it was full blown, went down, thrashed about, foamed at mouth etc.
The actual "fit" only last seconds, the rest of the time is recovery from it and then it is like nothing happened.
I agree with you that at this stage it is wait and see