Hi, the rule of thumb is to count back the time you have missed and then start again from there. So in your case if you are only going to be two weeks into SSB2 then effectively you are going back to SSBV1 following surgery.
On top of that, you need to think about the effort your body will be putting into healing, and also the loss of fitness over those four weeks.
Your race is the first week of July, if you take that first week as a taper you have roughly 12 weeks from the beginning of April. That is not enough time to complete build or speciality on top of SSB.
so, I think you have a few options.
restart at SSBLV1 and complete that plus LV2
restart at SSBLV2 and complete that then build.
Create your own modified plans based on a shortened mix of SSB1 & 2 plus build.
Ultimately I think your physical shape and retained fitness after surgery will have a lot to say in which option you take (or even a different one). If I had to choose for you I would say go back and start at LV1 again.
Some good reading here.