Subcision and Fraxel
Unless there will be multiple subcisions and/or extensive subcision ("undermining" and release), it should be quite safe to do both on the same day. The only other suggestion might be the use of the Fraxel re:Pair as opposed to the re:Store. The re:Store does give good results with multiple treatments, but in my experience the re:Pair may be slightly better. Discuss the options with your physician.