Hello ... I am a multi talented engineer , inventor !!! I have owned a retail store , manufacturing company and a construction company also ... I have a idea for a attachment that will work with your attachment for excavators and back hoes maybe even a skid steer . A grass seed broadcast spreader . One side with a hopper for seed and a broadcaster on bottom . Spin it around , it will hold a bale of straw and a wood chipper on bottom broadcasting the small bits on the seed . When the grass has grown there will be no need to rake up the straw because the straw will decompose ... I hope you like my idea and want to produce the product .