Very well, thank you. And I will not overburden you; some of what I study is, I freely admit, dull to most. What I believe may be the most successful strategy, if this is even possible, is to try a separation spell. Twinned souls may be separated. If I can, in theory, separate the mortal from the immortal aspects of a soul.
... I would obviously not test such a thing on a living soul, but I will find a way.