On occasion I get students who are either large in frame or overweight. Of these, a few can't climb back on their board without assistance. Of they can the first time, but are too fatigued to do so more than once. We use a flip rescue to help folks back on and have developed a few other techniques to help as well.
In searching for 'big people paddleboard rescue', I came across only one YouTube video on the subject. This guy (below) developed a smart system to get himself out of the water effectively, thus allowing him to continue to paddle without fear of not getting back on.
I had already developed a stirrup system but his knotted rope system is a great addition. I already made one and tested it out, works great! Downside is whether it'll work in wind and waves as you're limited to just the back end of the board. Doing so from the side immediately flips the board.
Attachment points to the board only works if you have a fabric or loose handle. You can attach one by using a handle such as this one by NSI. The stirrup by itself can be attached by the leash plug string or inflatable board rear handle.
Any questions give me a holler. email@example.com