In many practices, these surgeries are combined. Patients must understand that complication rates are probably higher when procedures are combined, and there may be risks in addition to those if the procedures were performed individually. In large series of patients, however, combined surgeries, when performed expediently by experienced surgeons, have very low complication rates.
It would not, in my experience, be advisable to reduce the implant size by 50% and perform anything but a Wise pattern incision, so I would not recommend a minimal incision alternative for that problem.
For the abdominal portion of the surgery, there appears to be extra skin, especially around the belly button. It might be possible to perform a version of the Hybrid tummy tuck(R) in which the deep tissue is fully tightened (reducing or eliminating the space between the muscles), redoing the belly button, and performing a low, small resection of the skin at about the level of a C-section incision.