Flexible life interest trust of property

My client and her two brothers have inherited the family home from their late father. Brother 1 lives in the property and can’t cope with the prospect of a move (he is on the autistic spectrum). My client has agreed to buy out brother 2’s share and to let brother 1 live in the property until he permanently moves out, and in return he will give her his share. My suggestion is that she creates a life interest trust of the property for brother 1, with overriding powers so that she and/or her children (I believe they are adults) can benefit from the property when brother 1’s interest comes to an end. I understand this will be an LCT for IHT purposes and for CGT purposes PPR will be available for the period when brother 1 lives there. Would it create a settlor interested trust if client is a beneficiary and what would be the tax consequences if so? Are there any other options?