Hi Isaiah,
I believe I saw in a prior post that you work at the VA. Try the Wounded Warriors Project, maybe someone can help you there, or guide you to a resource. I am including a few links as well,
the Abilities Expo has a list of resources,https://www.abilities.com/community/resources.html
the Amputee Coalition https://www.amputee-coalition.org/
and I have personally taken courses with Medfit (such as Adaptive Fitness, and Joint Replacements), https://www.medfitclassroom.org/.Devon Palermo wrote the Adaptive Fitness course, you could reach out to him as well, and his website is https://www.dpiadaptivefitness.co/our-services.html
If you don't already know about this site,https://www.hprc-online.org/ there is a lot of information on there in fitness and nutrition supportive information, I use this as a resource as well.
I also used Web Exercises in the past, which I saw you noted, and they are great. However, when it comes to special populations, it's always worth expanding your base. I would talk to any physicians you can within the VA(you probably have already). Also, from a nutrition standpoint, let the doctors provide them with an appointment with a registered dietician. I know you are seeking basic nutrition guidelines, but to be safe, I would refer out. They usually offer these services to Veterans. My husband is one.
I hope this helps! It can be hard to find people who share information sometimes and are reputable.