If I would be better off taking both boxes, I desire to choose to take both boxes; If I would be better off taking only box B, I desire to choose to take only box B; Let me not become attached to decision I may not want.
This doesn’t help in the general case. See, for example...
If I would be better giving Parfit $100, I desire to choose to give Parfti $100; If I would be better off keeping my $100, I desire to choose to keep my $100; Let me not become attached to decision I may not want.
A step closer to accurate (albeit in need of elegant wording) would be:
If I would be better off having precommited to taking both boxes I desire to choose to take both boxes...
This doesn’t help in the general case. See, for example...
If I would be better giving Parfit $100,
I desire to choose to give Parfti $100;
If I would be better off keeping my $100,
I desire to choose to keep my $100;
Let me not become attached to decision I may not want.
A step closer to accurate (albeit in need of elegant wording) would be:
If I would be better off having precommited to taking both boxes
I desire to choose to take both boxes...
“Would” has to be interpreted à la Gary Drescher in Good and Real.
A wording slightly less inelegant than yours would be “If I am better off being the kind of person that gives Parfit $100...”