Looks good,
I don't know if the brushless will like the abuse it will get but if you don't try you will never know

For my axe mechanism on Gabriel (feather)
I am using an un-bustable 150w brushed motor that weighs a tonne.
The drive is chain 1-4 reduction running a tri-lobe cam with an axe arm connected via a bolt
the idea is to run the motor for about 3 turns before it engages the axe arm 2-3 turns more
and the axe hits something
to prevent the motor stalling there is a torque limiter fitted.