I know this is very delayed and wordy response but I have had similar problems with being unable to reach the trim strap and bar when let go.
I am a girl, but not all that short, but I think this is a common problem with the depower rope/centre rope/chicken loop rope (WHAT actually is the correct terminology for describing the bits between the chicken loop and front line connection

).
I used to ride North kites, and I still think their design for the depower system is the best I have seen and wonder why the other companies have not figured out similar systems.
The depower rope is a continuous loop, meeting up at the trimming cleat. This cleat can easily be moved in position up and down the rope loop, effectively changing the distance from the chicken loop to the trim cleat (and thus how far out the bar sits when let go), without changing the effective overall length of the centre rope, and thus has no effect on kite trim.
It does change how much effect of trimming and sheeting in and out has on power (with the cleat closer, less bar movement causes more sheeting effect). It doesnt affect overall depower, or what happens if you release the safety.
I am fairly experienced (4 years), and made the decision to hybridise my old North depower/safety system (was a 5 line) onto my new and unreachable 4 line kite this year, which I have been very happy with.
However, I spent months thinking it over, and got a mate to fly the kite the first time post modification (as he is about twice my weight and could hold the kite down more easily if things went wrong

) in a safe place standing in water.
As a newb, I wouldnt do these kind of modifications, but would advise to go looking for the kites out there that have more user-friendly design with regards reaching the bar and trim straps.