Well I am glad to see you haven't given up because the 300/221 is one of the most cost efficient of the whisper type cartridges.
If you could clarify something you stated earlier. Do you have someone in the US who can ship you a completed rifle if gotten in their hands or do you need an independent dealer to export it to you?
Since a 223 bolt is not available for your action you will need a complete firearm it looks like. A T/C is what it is and make sure a single shot is what you are interested in. I prefer repeaters myself but I know people who hunt with the Contender pistols in 300/221. The link below is what I use to check current "mail order" firearm prices and you could look at the Savage Model 10 in 223 to see if that would suit you. There are people around who can rebarrel one of those in 300/221. That rifle, rebarreled, with the dies and brass delivered to someone who can ship to you should put you in the price range you stated. Of course everyone would have to make their little profit so I am not positive of that.
www.budsgunshop.com