I've had good success with Fabio Zonin's 5TRM program (3x/week for 9 weeks, including the final test week). According to the article below, it's based on phase 1 of military press plan 410 from the Plan Strong manual, but with modified intensity and NL. You use a main weight that's 90% 5TRM for ladders of 2, 3, 5 and an overload weight of 105-110% 5TRM for 1 (first 6 weeks) or 2 (last 2 weeks) singles on the low volume day.
With KBs you have to approximate a bit. For a 16kg 1RM, you could use 12kg for the main weight (75% 1RM) and 16kg or 14kg for the single(s), depending on how solid the 1RM is). For an 18kg 1RM, you could use 14kg for the working bell (77.77%) and 18kg or 16kg for the single(s). For a 20kg 1RM, you could use 16kg (80%) or 14kg (70%) for the working bell (if 80% is too heavy to get the 5s on the ladders), and 20kg or 18kg for the single(s).
I really like this program. The intensity is "comfortably heavy," it's a nice medium volume overall, has a nice waviness from day to day (although the total weekly volume increases linearly), and the overload singles gives you a taste of near max lifts, but in small doses. Throughout the program, the sets of 5 were challenging, but after following the deload/testing week schedule, I was able to crank out 12L/10R with my working bell, which was formerly about a 6RM (I did it with single KB MP).
Fabio Zonin 5TRM Program