Oh, I wish I had seen this when you first posted. I do have experience with the hormonal implant. Two of my ducks have had it. The vets were able to give it to my ducks without sedation or anesthesia. I have also successfully treated bumblefoot, with veterinary help.
I very much relate to your feeling of, "can't my girl get a break!?" I feel like that regularly.
My duck, Gingersnap, was on the implant for about a year to help reproductive issues. She was getting continually egg bound, like every few days. She would pass the egg, with anti inflammatory drugs, warm baths, and calcium supplementation, but of course it was painful and would happen again a couple days later. The implant would work for about 2.5 months, and then she would get egg bound again. Ginger passing away because of a severe respiratory infection, but we did keep the implant up every 2.5 months and it helped with her reproductive issues tremendously.
Thimbleberry has also had reproductive issues for most of her life. We have regularly contemplated giving her the implant, or even spaying her, but have been able to keep her issues mostly under control with "lifestlye." I would talk with your vet before implementing this protocol, but our vet recommended this for us and it has worked repeatedly anytime Thimble has had issues. Basically she is only allowed to eat scratch (Though... I also give her one cherry tomato and one mealworm a day), she has a strict 10 hour daylight schedule, and we move the stuff around in her sleeping room/aviary regularly. Doing this tricks her body into thinking it is not a good time to be reproductive because: there is not enough food, it is not the right season, and there might be hurricanes about.
Thimbleberry has also had a lot of problems with bumblefoot in the past. For treating it my vet gave me chlorhexidine soap (basically broadspectrum antibacterial/antifungal soap). It was challenging to wash her feet and not get her feathers soapy. I cut a hole in a plastic bag and put one foot at a time in it (like a surgical drape) and washed and rinsed her foot off really well. Fortunately she is quite cooperative and will just lay in my lap on her back while I mess with her feet. Otherwise I would have had to wrap her in a towel or have someone else hold her. After the washing I was instructed to pat her feet dry and apply SSD (silver sulfadiazine). Then they told me to wrap her feet in gauze and vet wrap. Thimble is really good at destroying shoes made of vet wrap, so I bought duck boots for her. I slip them on after the SSD cream. They velcro close at the top, and I just secure them with a little strip of vet wrap.
I think having a duck wearing a shoe all day probably works well in a not real life setting - I quickly found out that if Thimble drinks water and lifts her head the water runs down her neck and body and into her shoes. Then her feet are wet and muddy all day. It doesn't take long for the skin to get pruny. I just couldn't leave her in soggy shoes all day, so I let her run around barefoot during the day. I did the washing, patting dry, and applying the cream twice daily. At night I put on her boots. They keep the medicine on her sores and provide cushioning. I really recommend the boots. I got the neoprene closed toe boots from
http://www.partyfowlpets.com/shop They worked really well for me and Thimbleberry. I got two pairs so that I could wash and dry one pair while Thimble was wearing the other.
Thimble also seemed to be in pain, she was limping a little and holding one foot up often. So our vet prescribed metacam. She also prescribed an antibiotic once, and didn't another time when it wasn't so bad.
The other thing my vet recommended was preventing bumblefoot in the first place. I was using pine or aspen bedding in their sleeping room in our barn. She told me to have only dirt or grass in their aviary and to use only hay or straw for bedding. I have to change out the hay or straw weekly, because it does mold if I leave it for a few weeks. It isn't as easy to spot clean like the pine bedding. But... I haven't had bumblefoot once since doing that. It is worth the extra labor and cost to me.
Sorry this is so long. I wasn't sure what you might find useful!