Use saved gaussian model from sci-kit in pymc3?

Thankyou for writing in detail, But I am still confused where I am using my pretrained model from scikit in above approach you shared.

I can have mean and sd for Q1,Q2 and Q3 , but do i have to make GP process again in pymc3 for sampling, or I have to use only pymc3 GP only for this.
Thanks in Advance