Draft a legally binding agreement - take % share of will

Hi,

I'm seeking a will-writing solicitor/specialist legal writer to draft a legally binding agreement stating I would like to take my percentage share of the financial estate as agreed by all beneficiaries and executors of my late father's last will and testament.

The conditions need to include the following:
* All beneficiaries cited in the will agree to me taking ten per cent of my late father's estate for the value of (x), which I am entitled to.
* I acknowledge this means I have no future claim to my late father's financial estate, as this will remove me as a beneficiary
* The bank details for the money to be transferred to
* All beneficiaries are to sign this agreement, and it is deemed legally binding

Reference Files:
- late father's last will and testament
- email correspondence confirming my entitlement

Once you have accepted the job, I will disclose all the sensitive and financial details you require.

Thank you.