You should be able to do fine with keeping those within your limits. I grew a few Vietblack from Snowhigh last season and with gradual potting up and lots of slow release amendments they stayed under 4ft tall.
Hard to tell exactly based on the angle of these pics but these were about done stretching in one gallon pots. After it seemed like they finished with the stretch then I potted up to 3 gallons to finish.
I post this link frequently but it’s a great resource for those trying to achieve your same goals.