1. No to your first question, because willful disobedience confirms salvation wasn't there in the first place. In addition, if a person is truly saved they will do all they can to obey the commandments (spiritually) and endeavor to find out where they are falling short because of the love of God in their heart. So in both cases, the answer is no.
2. Same answer as 1. Spiritual people, grounded in faith will not look at the physical before the spiritual. Just the opposite, but not to neglect the physical even so. Anything else is hypocritical as Jesus' following words to the Pharisees confirm.
"Woe unto you, scribes and Pharisees, hypocrites! for ye pay tithe of mint and anise and cummin, and have omitted the weightier matters of the law, judgment, mercy, and faith: these ought ye to have done, and not to leave the other undone." Matthew 23:23
3. Answer to a question you didn't ask. We wouldn't be concerned (deep in our own heart) about the physical ramifications if we were secure in Spirit. With that said, a spiritual man or woman knows they fall short all the time, like the more I find out about God's word, the more I realize how little I really know. That isn't a hindrance, but certainly not an excuse to not study the word of God to find out the truth with all diligence. The Spirit and the Word of God ALWAYS work together without fail. They CANNOT be separated.
If we look at these things with a necessity on our part to work it out, then we are relying more on ourselves than God. Faith without works is just as dead as works without faith.
you were o.k. up to here. eating pork has nothing to do with our salvation. wrong. wrong. wrong. Jesus said that NOTHING that enters a man defiles a man. also Acts 10, Peter's house top vision. maybe I mis-read or mis-understood but if you are saying that we have to follow O.T. dietitary laws that is a flat-out lie.