Well if we’re going down that route then a Hohner Marine Band gob iron would do the trick, and you can get them in most keys for very little.Why not consider the ubiquitous cheap, Chinese Melodica.
It's made of plastic with brass reeds. I bought one recently for under £12.00 including carrying case and free postage and it's brilliant.
A couple of the notes needed tuning but it only took 10 minutes to dismantle it and tune them to an acceptable standard.
Only down side is you can't drink and play at the same time.
However, if it gets damaged or accidently (deliberately) lost over board, then it's no big deal