Vico…Every bishop I have spoken to in regards to this both Latin & Byzantine, have clearly stated that when a person or family chooses to practice the faith in a Ritual church NOT their own, they are perfectly free to practice following the discipline of the church they choose to practice in. This is in regards to infant communion/chrismation, fasting regulations and holy day “obligation”, basically everything! If they then decide to change Ritual churches fine, but how is one to know if you are truly meant to be an another church without having lived in it?
It is still not clear what the bishops that you spoke to mean by discipline since (Merriam-Webster) discipline means:
4: training that ["]corrects](
http://www.merriam-webster.com/dictionary/correct[1), molds, or perfects the mental faculties or moral character
5a : control gained by
enforcing obedience or order
b : orderly or
prescribed conduct or pattern of behavior
c : self-control
6**:** a rule or system of rules
governing conduct or activity
The canons fall under 6, the bishops you spoke to may mean 4 or 5b or 5c, and mean with respect to the faithful or the clergy.
Metropolitan Schott said the canons regulate, (Merriam Webster):
1
a : to govern or direct according to rule *b *
(1) : to bring under the control of law or constituted authority
(2) : to make
regulations for or concerning <
regulate the industries of a country>
This is known to bind
particularly on the bishops, priests, deacons, and those in the religious life. The way that the sacraments are given through the clergy is to follow the ritual of their Church sui iuris (or another with given faculties) and also conform to the prescriptions of the ascribed Church sui iuris of the faithful receiving them. Since the faithful may not know what this means, it is really binding upon the clergy, and they are not following the canons in all cases due to ignorance: as Metropolitan Basil Schott states in the book I quote from (2009), “…codes continue to regulate … even though experience testifies to the fact that the often-followed praxis does not always correspond to the norm”.