Suitable trust for disabled swiss beneficiary

UK domiciled testator has gifted legacy to adult child who lives in Switzerland. Child is mentally incapcable of managing financial affairs and swiss authorities have appointed sibling to manage finances.

Under terms of Will, where beneficiary is mentally incapable of managing affairs, Executors have power to pay/transfer legacy to trustees upon such discretionary or other trusts for the benefit of such persons and subject to such powers as Executors by deed appoint.

If the Executors want to protect the child’s benefit position in Switzerland, would a disabled person’s trust in UK be best option? Is it possible to create something similar in Switzerland? Any other suggestions welcome.

Samir Hussain