My thoughts exactly, now visualizing Owen as a parsnip obsessed troll from the mabinogion
No, you can't - the common way to form the present tense in Welsh is with a form of bod ("to be") and then add the main verb (the one conveying the actual meaning) in its verbal noun form (the base form you'd find in a dictionary), linked with yn.
eisiau is a bit different in that it doesn't take yn, but the rest of the sentence is similar (e.g. Mae Owen eisiau pannas; Dw i eisiau bara; Dych chi eisiau cwrw?; Maen nhw eisiau llysiau).
Good to see that Owen hasn't gone off his parsnips following the re-write!