Hello Lawrence,
Your wisdom is allways appreciated, thank you.
You could contact the front of A.
Right, but this ould not be possible if A was behind another element in a longer column. This would still mean that kinked columns are untouchable.
Alternatively:
You could enter the gap between A and B because you can enter a narrow gap by sliding sideways to line up in front edge to front edge combat. You would start by lining up corner to corner with opposite facing, then slide sideways into the gap.
Well, this is open to debate, as IIRC the current consensus is that a corner to corner contact only does not trigger the 80 p free move (remember that overlapping elements would immediately be shifted after its companions were recoiled, destroyed, etc. And this is not the intention of the game.
Then you have contacted his front edge and can trigger the third bullet under "Front edge" on page 33.
THis means either
A would have to move sideways, pivot or be placed behind another element to make room. This is limited to 80p of movement, so pivot is the most likely option, but the others may be possible. It looks (from your diagram) as though a pivot forward by A around its front left corner would make enough space.
Excellent! This was the answer I was looking for. Thank you.

But remember that The Phil must clarify the previous point in order to accept this
or B can be made to do the 80p move to line up, being dragged out of the column. THis may invalidate the entry into the gap as it is now not you that is lining up, but I think it is within the spirit of the "geometric ploys cannot be used to avoid contact " rule.
Same as before. Certainly it is a possible correct solution, but again conditioned to a previous corner to corner contact. Isn't there any other option avoiding this contact?