Yes, my APs are on DHCP. But I personally don't see this as a big issue. Change your ZD and make sure that you still have a way, on the new scheme, or before you switch to the new LAN addressing, to access your APs to change them manually.
What I would do rather is add the secondary ZD address, record the current AP statics (if necessary), then change all APs to DHCP, then change your ZD address, then after all the APs have gotten DHCP on the new scheme and synced to the ZD, change them back to statics.
Just my thoughts, maybe another Ruckus guru can give better direction.