Modifying Active Directory Connection Objects
Solution 1:
I don't have a play domain to test against - but if you change the schedule at the "NTDS Site Settings" instead of on each Connection Object, will that accomplish what you want? You may need to delete the existing Objects and let them get recreated with the new schedule.
Obviously, this won't work if you want to change the schedule for only some objects in a site but not all.
(Also, out of curiosity, what problem are you solving by changing this schedule?)
Solution 2:
I don't know how I forgot about changing the schedule at the site level instead of at the server level! I combined your approach with mine:
1) Reset the options attribute on the server connection object back to 1 (IS_GENERATED).
2) Changed the schedule at the site level to 4x per hour.
3) Right-clicked on each server's NTDS Settings object and clicked "Check Replication Topology" under the All Tasks sub-menu.
This allowed the KCC to automatically manage the connection again, pulling the new schedule from the site schedule and still maintaining the value of 0x1 IS_GENERATED in the options attribute. Done!