The A330 can certainly be fitted with a boom. Australia operates boom-equipped A330s, France, the UAE, Saudi Arabia, Singapore & S. Korea have ordered them, & the last I heard Qatar & a consortium of the Netherlands, Norway & Poland were negotiating to buy them. The UK is an oddity in having bought only hose-equipped A330s, & even odder in not fitting probes (which shouldn't be too difficult, with the main issue being placing, where the receptacle is badly placed for fitting a probe directly over it) to its aircraft fitted for receiving from booms.
Retrofitting some of the UK aircraft with booms would be entirely possible.