I think asking a bunch of randos on the Internet, with your list of medical issues and age (I'm only 7 years behind you), is a recipe for disaster.

You should at the very least attempt to get on physician prescribed trt with your primary. That should be step one. Trt prescribed by an actual doctor and covered by insurance ends up being cheaper than any underground gear you can buy, and the bloodwork you're required to get is priceless.

in the future, considering your bloods are coming back solid and you're healthy, can add in things as bloods permit. Things can go downhill in a hurry and without a Dr to fall back on you can be in for trouble.

GH and those healing peptides are worth looking into as well

In theory yes, as suggested below, look into TRT.
Depending on bf% you might want to consider Reta. This will help you lose weight and in turn reduce side effects.
Deca/NPP can help joints feel better but they don’t get healed. It is the extra fluid they cause to build up in the joints.

At your age TRT could be helpful assuming your levels are below optimal, which to I’d assume they are given your age and condition you’re in now. best to get your test levels checked first. Idk what decan p is but I don’t think you need that.. first time on hormones is always test only so you can learn how your body reacts. At 47 and presumably overweight risk of side effects are much higher so you need to be able to know what’s causing them which will tell you how to mitigate them. I’d do this through a TRT doc. You have to be very knowledgeable to manage this yourself and I doubt you’re there.