Good!
Christ was fully human and fully God at the same time
That is correct, however, if you wish to use that as an allusion to the Eucharist, then you would have to say that after the consecration, the wafer is fully wheat and fully God. Are you prepared to say that? If not, then I suggest you find a new analogy.
Would that be whole wheat, or holy wheat.
Sorry, i was bad. (slap)
No I don't think that's necessary at all. My analogy may not be perfect, but I think it's pretty dang good, I don't think there are any perfect analogies when it comes to explaining Divine revelation.
Christ is really, truly and substantially present in the Blessed Sacrament, Body, Blood, Soul and Divinity, under the appearance of bread and wine. One cannot not know this by by natural senses only by the gift of supernatural faith.
In the words of St. Thomas Aquinas,
Down in adoration falling,
Lo! the sacred Host we hail,
Lo! oe'r ancient forms departing
Newer rites of grace prevail;
Faith for all defects supplying,
Where the feeble senses fail.