No, the Law cannot be changed.
The law was fulfilled by Christ when He lived it perfectly, every last bit of it, and we are no longer under the power of the law because we are in Christ.
The law is still God's standard of Holiness and it is what it is to lead us to Christ that we might be justified by faith.
It was set aside when it was super-ceded by the new covenant, but it was NOT changed.
Besides, the prohibition against eating blood was given before the law and was reiterated after the new covenant was established, at the Council at Jerusalem.
The prohibition against eating blood stands outside the Law even though the law addresses it.
So even if the Law could be changed, that prohibition cannot be, and was not.
So that argument that God can do anything and God can change the law if He wants, fails.
A distinction without a difference.