Well I agree with all you say here except for the phrase "in place of biblical feasts and sabbaths".

In the New Testament, living in our Savior Jesus Christ (you can use the Hebrew version if you prefer) IS the substance of these things, which are only shadows which point to him.

Do you believe the teaching of the apostle Paul?

Colossians 2:16 Let no man therefore judge you in meat, or in drink, or in respect of an holyday, or of the new moon, or of the sabbath days:
Colossians 2:17 Which are a shadow of things to come; but the body is of Christ. (KJV)