Originally Posted by sdsearch
If it had been the other direction (had you earned miles but wanted points instead), it would have been out of the question [emphasis mine], because once the miles are sent to an airline they cannot be recalled.
Don't be so sure of that. A sympathetic rep might be able to delete an "incorrect" original miles-earning stay, re-set the member preference as it should have been, and re-enter the stay, with the effect of a "triple dip."