Your problem is that not many sequencers in Eurorack work to 16 steps without skipping displays. the klee is fairly unique that it has all 16 on the front panel. I do something similar with 2x Pressure points, but have to have 16x pitch and 8x gate length, as a maximum, so gate length repeats per pitch sequence.
You need a pulsewave oscillator connected to an envelope generator with the width of the pulse creating the gate length for the each step. this osc would be synced to the klee clock.
you could mult the output form the Klee into the PWM control of the pulse osc and that would give you longer gates when notes were higher… but not definable.
if you put a S/H before the PWM and then clocked with a division of the klee clock, that would give you groups of notes all different lengths.
klee output (attenuated) into a precision adder ( like disting) could give you varying clock lengths but the ability to offset using the adder to bring everything up or down, but the klee would prevent it sounding too static.
TL:DR.
You need something with 16 steps as a voltage source, if you want to do per note easily.
4x Pressure points & Brains
4x Tirana
1x Korg SQ1
otherwise you’ll have to get creative.