if you are really concerned about rupture, learn about it. the risks are really really low- but knowing that may not help your mind get over the fear of one.
ruptures tend to happen a certain way- i'd suggest going drug free bc i have heard that the pain of a rupture isn't like ctx. it is contant and doesn't come in waves. also i think your bp will drop. (ETA- that URs aren't immediately catastrophic- if you have adequate care and attention, your cp will be on top of it). knowing these things, and making sure your cp knows them is a step to becoming more comfortable with taking on the minimal risk of UR.
that being said- an elective c-section is just a scheduled uterine rupture. it is more controled and the outcome tends to be better but still, recovery sucks, especially when you have a toddler needing love and a scar needing healing.
educate yourself- and make the choice.