Mr Suddards, 59, was found dead at his vicarage in Thornbury, near Bristol, in February.
Reverend John Suddards was found with multiple stab wounds at his Thornbury vicarage on 14 February last year.
But Castle Secondary School, Thornbury, was only open to years 10 to 13.
About 300 people took part in a church service at Thornbury Baptist Church on Friday to mark Mr Suddards' death.
He has admitted the manslaughter of the Reverend John Suddards, in Thornbury, South Gloucestershire, on the grounds of diminished responsibility.
Steve Webb, MP for Thornbury and Yate, said while he understood the need, it would be a "very big change".
He moved to the Thornbury parish six months ago and previously spent a 10-year spell in the Diocese of Chelmsford in Essex.
Stephen Farrow stabbed to death the Rev John Suddards, 59, in Thornbury, near Bristol, and teacher Betty Yates, 77, in Bewdley, Worcestershire.
The authority's main offices are in Thornbury but it has other sites across South Gloucestershire including offices in Kingswood, Yate and Patchway.
Some partially upgraded areas which will also fall within the intervention area include Thornbury, Chipping Sodbury, Downend, Bitton, Filton, Winterbourne and Kingswood.
On the evening of 22 February, Mr Farrow was charged with the murders of Mr Suddards, Mrs Yates and the burglary in Thornbury.
Stephen Farrow stabbed to death the Rev John Suddards, 59, in Thornbury, near Bristol, and Betty Yates, 77, at her home, in Bewdley, Worcestershire.
He was found guilty on 2 November of murdering both Mr Suddards, 59, from Thornbury, South Gloucestershire, and Mrs Yates, 77, from Bewdley in Worcestershire.
Steve Webb, MP for Thornbury and Yate, said it would be set up on the site of the former Ashfield Young Offenders Institution which is closing.
The court was also told Mr Farrow's DNA had been found on the cap of an empty beer bottle found at the vicarage in Thornbury, near Bristol.
Later that day, he was arrested on suspicion of murdering Mrs Yates at her home in January, and of committing a separate burglary at another property in Thornbury over the Christmas and new year period.
She said the diocese had done its best to make sure she felt safe moving in - although Thornbury vicarage is not considered any more dangerous a place to live than any other - but added that she was glad her husband and dogs would be there to keep her company.
BBC: Vicar replacing murdered John Suddards tells of her hopes
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