I don't see the problem of not being able to reverse the leg. Betza notation is for boards with a translation-invariant 8-neighbor topology, and that it would not work for other boards is normal and unavoidable.
As I said, if the issue was the weird board, than it would be a non-issue. The problem is if the approach path is something like yasfR or y(a)5K (both of which I actually would use; in fact, yasfR is what made me realize that the problem wasn't limited to weird geometries.
If a modifier for self-unloading was necessary, I think that u' would be the obvious choice.
It doesn't seem obvious to me, but that's probably just me.
Then a marker for where the piece "captures" itself, both for this purpose (the "load" spot won't always be the end) and what Daniel brought up would be needed; I suggested the tilde (~) because it's not likely to be needed for anything else, but a` could make a nice counterpart to u'.
As I said, if the issue was the weird board, than it would be a non-issue. The problem is if the approach path is something like yasfR or y(a)5K (both of which I actually would use; in fact, yasfR is what made me realize that the problem wasn't limited to weird geometries.
It doesn't seem obvious to me, but that's probably just me.
Then a marker for where the piece "captures" itself, both for this purpose (the "load" spot won't always be the end) and what Daniel brought up would be needed; I suggested the tilde (~) because it's not likely to be needed for anything else, but a` could make a nice counterpart to u'.