It looks like you are on the right track.

If I were you I wouldn't stock LMB if I wanted SMB.In ponds that have SMB and LMB, the LMB outcompete the SMB. You can probably get around this if you harvest more LMB every year to try and keep the populations the same. Some northern pondmeisters will be able to give you a better idea on the numbers.

Also make sure the fish you buy are big enough to not be eaten by the trout and yellow perch.