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it is by faith and NOT of ourselves

Grace is not of ourselves. Both faith and good works are responses to grace.

Doing what is good is "excellent and profitable", no argument, but NOT for salvation, is it?

St James says it is for salvation ("faith did co-operate with his works; and by works faith was made perfect" Ch. 2 v 22, as is, of course the entire passage); St. Paul continues on to Titus in verse 10 to "excel in good works". Each time salvation is mentioned like in Eph 2 or Titus 3, good works are also mentioned as a necessity. Exception is Romans 4, but there the topic is necessity of circumcision, not goos works.

Paul wasn't speaking to just Jewish believers

True. He was speaking (in Galatians) to the believers who thought they had to follow the Jewish law. He nevertheless reminded them that law or no law, faith must work through love (Galatians 5:6).

what kind of "good works" are you insisting Paul taught granted salvation?

[12] Put ye on therefore, as the elect of God, holy, and beloved, the bowels of mercy, benignity, humility, modesty, patience: [13] Bearing with one another, and forgiving one another, if any have a complaint against another: even as the Lord hath forgiven you, so do you also. [14] But above all these things have charity, which is the bond of perfection: [15] And let the peace of Christ rejoice in your hearts, wherein also you are called in one body: and be ye thankful.
[16] Let the word of Christ dwell in you abundantly, in all wisdom: teaching and admonishing one another in psalms, hymns, and spiritual canticles, singing in grace in your hearts to God. [17] All whatsoever you do in word or in work, do all in the name of the Lord Jesus Christ, giving thanks to God and the Father by him.
(Col 3)