Questions concerning 40-155

My customer has double inswinging exterior doors (1-3/4" thick) that exit her 2nd floor bedroom onto a flat roof. The same opening has double outswinging wooden screen doors (1-1/8" thick).

The flat roof does not have a rail.

She would like to be able to keep the inswinging exterior doors open and lock the outswinging wooden screen doors with a key from the interior so she has fresh air ventilation while limiting access to the "rail-less" roof to herself. Keeping people outside is not a concern. She is more concerned with keeping people from going out onto the roof.

It seems that the 40-155 might be able to solve this problem if I were to install it in reverse, with the keyhole facing the inside.

1) Is the Strike Plate for the 40-155 available in brass?
2) How far does the deadbolt extend out when locked?
3) Is there a double keyed version of this?

Thanks,

Gary