I'm wondering if you have a rehab. type place you could go to for some of your recovery and to have PT there as well ?? For my area ( Indiana) we have nursing homes that will take any age of a person in just for their recovery process for people who do not have anyone living or staying with them.
Your weight loss will help you a lot with the pain in your knees. My OS told me years ago, that for every pound I ,lose it's like 5-6 pounds off my knees. It does make a difference. Your PT is a great idea, to help strengthen your muscles
I hope your able to have your knee replaced when the time is right for you, you'll know when that time is, you will have had enough pain you can't stand it any more. I was 50 years old when i had my right TKR in 2012.