Might I suggest you take a look at the earliest of Church teachings and discern whether they believed in the real presence of Christ in the Eucharist?
The teachings in the first century are extremely clear on the presence of the Lord in the Eucharist. Seriously, read those who likely were Catechized by those who walked with Christ.
I have, and I don’t think they support transubstantiation at all, which was a much later formulation. Indeed, I believe many among the early fathers would be welcome in most old school reformed congregations. I doubt they would be comfortable with the contortions of Aquinas on the matter.