Set a proxy individually for each WebBrowser?

Question

I just found out how to change proxies without restarting the WebBrowser control, but that seems to set it for ALL WebBrowser controls on my form. I want to be able to set a different proxy for each control. Is this possible?

If not, is there any tricks I can do to get around this? Maybe some kind of daemon that watches a port and translates that request into a proxy request? For example:

Request on port 12345 -> Connect to url on port 80, but use proxy 1.2.3.4:8080
Request on port 12346 -> Connect to url on port 80, but use proxy 6.4.5.1:8080