In regards to tracking pixels - if you don't think it's trustworthy, don't click it!
The thing is: YOU DON'T NEED TO CLICK THEM. Just opening the page is enough.
I can offer hosting and bandwidth for an image proxy. Get me the script and I'll install it on one of my servers.
I have a script if you want to use it, it is all in php and probably needs some space to hold some images, but also a mysql server and cron.
I try to put it on github tonight or some time after I test it.
As said: 10TB/month available.
I can even get a domain for it(already have a static IP).