A ground Blind should work fine depending on where You set it up so You have a better field of view,not sure which ones would be easier for You to get into with a wheel chair?
Some can simply flip up and You go under them,most have a small opening in the back corner and can be pretty hard to access them after un-zipping them.
Maybe if You look thru the different designs of Blinds at Bass Pro and Cabela's You'll find one that suits Your needs?Most Blinds they have now are a decent size with a lot of room in them to move around and will fit 2 to 3 People comfortably or a Hunter in a wheel chair.
Another thing to consider is maybe making a few home-made ground blinds by putting steel fence post or wooden stakes in the ground in the shape of a square and leave the back-end open so You can enter from the back side,then put Camo material on the 2 sides and front.