I like GingerK’s suggestion. Once the blocks are all the same size, your only modification will be the location of the new blocks. If they are scattered over the whole quilt, no one will notice. If the new scant border is a noticeable new color, then you can make the new block’s arrangement a real focal point. Either way, the new border concept involves no throwing out, no taking apart, and maybe a new way to play with arrangement. Win-win.