Just look at ID20 (MQ)/ID-62(PQ) and the warm tone variant ID-78.

Replace the Phenidone with 3 grams of Metol, you may need to add a gram or two more of Bromide. That is around 10x

Use either formula Neutol WA or ID-78 they give virtually identical results, but as Metol is a fraction colder working you may need to add an extra gram of Potassium Bromide.

Ian