This is probably one of the most interesting topics in Orthodoxy due to contemporary scientific knowledge. Probably the best question to ask is not whether you're unorthodox or not, but how would the Fathers have reacted to the scientific knowledge given today, as well as the way the scientific methodology being used that is totally different from the speculative sciences of their day? This would be quite an interesting dissertation to read, imo.
On modern opinions of this, the ex-atheist Christian geneticist Dr. Francis Collins also thought about it and looked to CS Lewis as his guide. CS Lewis took an interesting approach saying that he more or less did not know, but keeping with the spirit of the fathers, he considered that there could have been a Fall, certainly not just one man and one woman, but many men and many women, or one man and one woman who were first in Paradise before many men and many women. It's certainly may not be a tree (as Origen also implied), but some sort of disobedience that lead not just one, but took many others down with them to a "Fall." Or if it was just these two, these two were simply fallen and could not maintain a grace for others to follow in exemplary fashion. Either way, he maintained a belief that there had to be more than just Adam and Eve as well as keep in line with the doctrine of the Fall. I tend to agree with this line of thought. You don't have to necessarily take the trees, the gardens, the days of creation, even the mode of creation of Eve as literal, but as allegory. But there are other core beliefs that have been held, especially the idea of the Fall.
In addition, in Coptic liturgical tradition, there are some prayers where we commemorate the specific figures of Adam, but the main prayers do not stress Adam, but stress that when "a man" disobeyed God's commandment by the deception of the serpent, "we fell" from eternal life and "were" exiled from the Paradise of Joy (Basilian Liturgy). "I ate from the tree" (Gregorian Liturgy). The story of Adam and Eve take a very personal tone, in which Christ was incarnate for my own salvation of what I had done when I was in Paradise. So the case of allegory in Adam and Eve seems to have a strong case based on these prayers alone.
However, I doubt we would find consistency in this in any liturgical or patristic tradition, for it seems that it does not exclude the belief of an actual Adam and Eve. I do know that allegory goes as far as not actually considering that the commandment was actually that of eating from a tree or that the demon actually appeared as a snake with legs, but that these specific things were allegory. One then wonders how far these Alexandrian-oriented fathers went with allegory, and if so if this includes Adam and Eve as purely allegory themselves?