Using the trade calculator (because we all know internet calculators are really the only thing you need in life):
Trade the 2nd to Cleveland for the 4th and 26th.
Trade the 4th to Atlanta for the 6th and 68th (3rd round)
Trade the 44th (2nd rounder), the 68th previously acquired from Atlanta (3rd round) and the 75th (our 3rd round) to Kansas for the 23rd.
That would give us FOUR first rounders (but no second or third rounders):
6th, 13th, 23rd, 26th
(are we almost there yet? now? how about now? now?? when are we going to get there???)