I have used a lot of Kwik Sew knit shirt patterns and I have often noticed with the one piece fronts that the front and back are often the same except for the neckline and the sleeves are often symmetrical front to back. When this is the case, I redraft the pattern with my length alterations onto sturdy butcher paper making one sleeve for each sleeve length and just one full sized back. Sometimes I'll lengthen the back piece for a dress. Over the years I have also drafted an assortment of neckline treatments from different patterns (with 4 or 5 inches of the shoulder lines for centering the pieces), a crowl, a 'v' neck, turtleneck, a scoop neck, etc. each with a front and back.
DH made me a 4'x8' cutting table at a suitable height and I covered the table with 4'x8' cutting surface. I used to hate to cut out patterns but now just I throw my knit fabric on the table, toss on the 2 butcher paper pattern pieces with weights on top and go at it with a rotary cutter. No pins needed. I'll do 8 to 10 shirts or dresses in a row this way with different fabrics. It only takes about an hour.
After the generic shirts and/or dresses are all cut they can sit in a pile until I'm ready to use them. When I'm ready to finish them I get out the necklines and decide which neckline treatment I'll use for each and cut each front and back piece with the neckline pattern. When they are all put together I have a collection of knit shirts and/or dresses that are all different. If I'm just doing just one shirt or dress from beginning to end it only takes about 2 hours to complete.
I draft all my pattern pieces regardless of the style or fabric to be used to butcher paper even if I know I may only use the pattern one time. I only have to make my alteration decisions once and it's ready at a moment's notice when I get the impulse to sew, and I don't have to deal with the messiness of shifting tissue pattern or worry about the cat that loves to help me by tearing and rolling on tissue paper when I'm trying to cut. I buy a commercial roll of butcher paper every few years. HTH.