I was able to do it by using note values and calculating things separately (in Ruby, some leftover scripts from my monome 64 days - how I wish it would connect to Ansible!). I just took my time and typed them into the pattern tracker.
See, I’m a newbie, starting to get the hang of shorter code and calling things.
But as a programmer, I do long for more control, loops with multiple lines, arrays, longer scripts. In the write preset window, I can scroll many lines, so the esthetics argument seems a bit silly to me.
I do love the Teletype but it’s kind of a shame it’s so limited. I start to appreciate that it’s opinionated, and I have to work through puzzles each time I want to accomplish a new project - which leads, of course, to happy accidents 
Maybe I’ll take a look at the firmware repo and get inspired for a pull request? Or perhaps there’s limitations due to memory and hardware?
Thanks @scanner_darkly for the suggestions!