Production Support strategy during support packs application

Hi

We are planning to apply latest support packs very soon. We have a five system landscape, viz, One sand box, one development system, one QA system and an additional Test system for special project testing and a single instance production. Our challenge is that we have to continue to deliver multiple initiatives in parallel to the application of support packs. We have applied the SPs to the sand box to understand the differences and we are currently testing over there. We will have only a two weeks of solid change freeze period. When we apply the support packs to development, can we safely move the exisitng or new change requests to QA and then to Production without a severe impact. I would like to know any recommendations or learning points. We are on 4.7 version. Thanks in advance

Srinivas