What nonsurgical procedures would be best as an alternative to a mommy makeover and how much improvement is achievable? (Photo)

From your photos you have mild breast asymmetry. You can consider breast transfer to help improve this as long as you have adequate fat for transfer. BodyTite combined with Morpheus8 may be an option for skin tightening of up to 40%. I encourage you to visit with a board certified plastic surgeon near you to discuss these procedures and determine if you are a good candidate.

Breast fat transfer is a great tool to balance breasts, improve symmetry, and gain up to one cup size in volume. In general, 200 cc per breast is typically the upper limit of fat injection recommended by most plastic surgeons. It is not that more cannot be injected; but on average, this has been determined to be the most that can be expected to live during one transfer. Multiple transfers would be required for additional cc's. In general, the abdomen and thighs are preferred donor sites but fat from other areas can be used. The fat must be injected through multiple planes in small amounts to the tissue through one tiny incision under each breast. About 50% of the fat obtains permanence. Thinner patients are outstanding candidates in my opinion, because the fat transferred is extremely resistant. Results are largely dependent upon the skill of the surgeon, his/her ability to remove fat without creating contour deformities, and your expectations.
You may be able to avoid the TT, but this will depend upon your exam and the precision with which the liposuction is performed. How flat the abdomen will be will depend upon how much fat is removed from the area as well as how you heal; however, the lipo will not repair the diastasis recti. The great thing about having lipo and TT after pregnancy is that the transformation that occurs in a couple of hours in the operating room trumps any period of time in the gym.