Due to licensing restrictions, two harmonized versions cannot be published, not even one in which the pedal and every note contained in the accompaniment is also in the original.
Robert Bridges wrote 'All my hope on God is founded' as a paraphrase of the Joachim Neander hymn 'Meine Hoffnung stehet feste' (lit., 'My hope stands fast,' c. 1680), which he published in his own 1899 volume, the Yattendon Hymnal.
The hymn tune MICHAEL was written in 1935 by Herbert Howells, a memorial to his 9 year old son, who died that year of polio (or possibly, meningitis). This was one of several compositions written for or about, or inspired by, this catastrophic event in Howell's life. This includes a Requiem, which remained in a desk drawer until it was published in 1981, more than 40 years following Michael's death, and only two years before his own.
This is a tune - 'Still from man to God eternal' - that your sopranos can use while everyone else sings (and the organist plays) the Howells arrangement as written.
The harmonized versions of MICHAEL - both of them - have been sent to my private repository for personal use and study, awaiting Jan 1 2034, when the copyright expires. You'll have to make do with any bootleg copies that may be floating around out there.
Still from earth to God eternal sacrifice of praise be done,
high above all praises praising for the gift of Christ his Son.
Christ doth call one and all: ye who follow shall not fall.
– Joachim Neander, 1680;tr. Robert Bridges, 1899