In theory yes. But the additional parts you'd need to change and modifications you'd have to make would work out five times the amount of buying a turbo in the first place.
Yours is P reg? So early type NA. Best things to do is get a plug n play chip from flea ( £50 ish) a decent cat back exhaust, and some good springs and shocks. Those items transform the NA. With a decent exhaust alone the growl of the 20v will never get boring
Basically you need to swap the complete engine with accessories/turbo/manifold/exhaust, ECU, EBV, atmospheric pressure sensor + wiring loom to engine bay.