The following is an amateur translation of a "Paraklesis Canon to the Twelve Holy Unmercenaries: Kosmas and Damian, Cyrus and John, Panteleimon and Ermolaos, Sampson and Diomedes, Mokios and Aniketos, Thallelaios and Tryphon". I am unaware of who wrote this service, and when it was written. It should be noted that most Orthodox sources traditionally number at least twenty Unmercenary Physician Saints (two additional sets of Sts. Kosmas and Damian, Sts. Eutropios, Leontios and Anthimos, and St. Julian of Emesa are missing from the above list). Please note that in the service below, any mention of twelve Unmercenaries I have replaced with the generic "Band" of the Holy Unmercenaries.
According to the following site, the traditional feast of the Synaxis of the Holy Unmercenaries is celebrated in the Greek tradition on October 17th, for which a full service has been composed (in Greek): http://analogion.com/forum/showthread.php?t=15637.
In honor of the upcoming feast of Sts. Kosmas and Damian the Unmercenaries of Asia Minor, I offer the following service. I request reviewing the translation before any public/liturgical use. Also note that the meter of this translation is not set to match the original music.
May the compassionate and wonderworking Unmercenaries grant us all healing of soul and body, as they are imitators of Christ, the great Physician and Shepherd of His sheep!
Paraklesis (Supplication Service) to the Holy Unmercenaries (amateur translation of the Greek text here: http://www.pigizois.net/latreia/paraklitikoi_kanones/paraklitikos_kanon_dodeka_agious_anargirous.doc)
[Note: Most Parakleses include an ektenis at this point. The following hymns would then be used before the petitions:
Turn to me, in your good favor All-praisworthy Theotokos, and do thou behold my body's grievous infirmity, and heal thou the cause of my soul's sorrow.]
And the priest entones the ektenis.
Verse: Hear this, all nations.
The Saints who are on the earth, the Lord has shone wondrous.
The transformation of all trials, and the deliverers from every sickness you are, O holy famed [band] of sacred Unmercenaries, save us all from the movements and influence and evil of the enemy, through your divine intercessions towards the Lord.
O Saints of God, intercede for us.