I'm beginning to think it might be an idea to leave Coron until we're a bit more experienced and do No.2 on the list
As Allison Finch said, most of the diving at Coron is quite easy. The missus has enough experience and training to safely enjoy every wreck that's there. There are some parts of some wrecks which might be off-limits but the majority of what Coron has to offer is available and easily done by a diver at your wife's level of training and experience.