I do not know about any private proxy for IRC but you can always get list of SSL working proxy (proxy that support connect method) on proxy sites.
Of you can collect a lot proxies and then simple run proxies through one of many IRC proxy checkers to find out which one is working.
[URL="http://www.proxyblind.org"]Free Proxy[/URL] | [URL="http://www.proxyserverprivacy.com"]Proxy Server[/URL] | [URL="http://www.ipaddresslocation.org"]Ip Address[/URL] | [URL="http://www.proxyblind.org/list.shtml"]Proxy List[/URL] | [URL="http://www.bearplanet.org"]Polar Bear[/URL]