I have heard that some folks know of a way to open the boot from outside, but it's not the kind of info that is often posted online, for obvious reasons.
Can you not just simply lever the top of the drivers door open a tiny bit, and then use a long lever (whatever is to hand, like a long bit of stiff wire or something) to hook open the door release handle or boot release lever.
If you only open out the top of the door a tiny bit, it will spring back into place, or can simply be pushed back. Even something like a wooden door wedge will do it, as it will release the top edge of the door enough to get the wire in, but should not damage any paint work.
Sorry I can't be of more help.
Can you not just simply lever the top of the drivers door open a tiny bit, and then use a long lever (whatever is to hand, like a long bit of stiff wire or something) to hook open the door release handle or boot release lever.
If you only open out the top of the door a tiny bit, it will spring back into place, or can simply be pushed back. Even something like a wooden door wedge will do it, as it will release the top edge of the door enough to get the wire in, but should not damage any paint work.
Sorry I can't be of more help.