I love Haws. I have adopted from them many times. I have a little white mouse named Boo that I got from there. I also enjoy helping volunteer for their events. Technically, they are not a no kill shelter. But they only euthanize in cases where the animals can't be rehabilitated or are ill.
They also do ads for people looking to rehome pets, but again, they have to be neutered. I also don't want to give him to a shelter. I think he'd be much happier staying here until he finds a home. I hate the idea of him being in a cage, and if he doesn't find a home, there would be the possibility of putting him to sleep due to his leg issue.
My suggestion would be to contact a local TNR group and explain the situation. Some groups, such as Dane County Friends of Ferals (located in Madison) hold regular feral spay/neuter clinics. Friends of Ferals does apparently allow members of the public to book appointments at their clinics--it's not free, but they only ask $25 for both surgery and vaccinations. Their website says that the clinic is specifically for outdoor cats, but if their clinic is anything like our feral spay/neuter clinics in Toronto, feral kittens that have been fostered and socialized while waiting to be large enough for early spay/neuter still qualify, even if the ultimate goal is to find them indoor homes. In addition, many cat rescues and TNR groups hold adoption events specifically geared towards finding homes for tame cats or socialized feral kittens that they've acquired as a result of their TNR activities, and may be able to help you get your remaining kittens adopted as well, either at an adopt-a-thon, or by posting the kittens on their website, or even by suggesting other resources or organizations that may be able to help.
Here's the link for Dane County Friends of Ferals:
I just Googled "Wisconsin trap neuter return" to find their site, and I haven't done a ton of digging, but it looks like a good place to start. They also have a resources page, which might help you find TNR resources a little closer to home. I would suggest calling and speaking with someone at whatever rescues you do contact if at all possible.
I leave for Wisconsin this Sunday. We'll be staying with my aunt and uncle in Fort Atkinson, but we'll likely take a day trip or two into Milwaukee to visit some of my cousins. If there's any way that I can help while I'm in town, let me know. I'll have my phone with me, so I should get catforum updates while I'm there.