According to Chazal, Gematria is only valid in Lashon Hakodesh. The people who used Ancient Greek to calculate Gematria did so because Ancient Greek letters correspond to numbers like in Hebrew. Nonetheless, I’m pretty sure using Ancient Greek in this way is enough to get you the title of Kofeir because it implies there is holiness in Ancient Greek. The only way you can use it is to explain why a Kofeir or a goy would think/act in a certain way. (But I could be wrong. Ask your LOR.) I hope you are joking if you think Jews would ever entertain a thought of using Gematria in English. Even according to the goyim, English letters do not have (official) numerical values, so the whole concept is silly.
Since we are being silly, I will say that Donald Trump is orange because he supports the former residents of Gush Katif 🙂