I would not recommend apple or peach for zone 10. The apparently dead citrus plant will show in a few weeks if it can come back or not. I suspect the chances are slim unless you see green wood at the base of the trunk and/or lower branches. Give the oak tree some time before pruning the top back. That pruning won't kill it but may mess up its natural form. If the top doesn't recover then go ahead and prune it back.
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