Except for a very very small "user fraction", and the idea not being that useable - the idea is a bit challenging/interesting !
How to make a kite that turns well, on 2 lines (so no center line to get in the way, or pulley bar systems or anything - just two lines), and with power adjustment made "at the kite with trim/knots" before going out ?
Maybe you can take a 4 line C kite or SLE kite, and simply connect the front and rear lines a bit down (and adjust the power on knots this way), and thats it ?
Without making a brand new kite.
OR, if you should make a kite specific for this purpose - would it be a normal kite, just with a bit different connection points ?
Or in its "perfect" sense - how to make a two lined kite that turns well with a short bar, with as few lines as possible at the kite ? (no bridles, no crossover lines)
Maybe only one series of connection points at each side, so can be moved forward/rearward for trim - but still only one connection point when flying.
I dont think it is easy, as you use the rear lines to turn the kite
Kindly, Peter Frank