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Have you considered executing a Will to give effect to your wishes? Is there any particular reason why you have not considered this, it seems the logical step forward.
Bequests are made in Wills.
It can be challenged but you can limit the likely exposure to a challenge by giving detailed instructions to a solicitor rather than making one yourself and making them specifically aware of your concerns. They check to make sure you have capacity and understand the implications of your decision. They could swear to this in the event of a challenge to it.
A Will really does offer the most security for post-death arrangements and seems the most approprirate to your circumstances, you will have to decide the value porton of the equity to leave your partner and how long she should have a right of occupation in the property and a Will can be drafted to reflect this.