"Of" vs "From" for relative times

The product will be launched within 6 months of/from project kick-off.

‘Of’ typically indicates possession, but ‘from’ can be used to describe future actions. The product launch depends on the kick-off date, but I’m not sure if it belongs to the kick-off.

Also, I do not want to say "will be launched 6 months after kick-off" because that communicates a strict 6-month timeline.