Sounds like you are talking about the "Cooperative Program" of the SBC. We voluntarily participate in missions, seminaries, a publishing arm, etc. yet maintain local autonomy.
By "2nd work" am I correct in assuming a "second work of grace" whereby the gift of the Holy Spirit is bestowed on believers at some time after salvation? If so, then we probably have more to talk about, specifically But ye are not in the flesh, but in the Spirit, if so be that the Spirit of God dwell in you. Now if any man have not the Spirit of Christ, he is none of his. (Romans 8:9)
See, and we interdenominationalist in my church have the FCCM--Family of Connected Churches & Ministries, which is designed to be like the ancient churches.