This may sound far fetched ...but I would try it.
If there is a degree granting school nearby ..in landscape architecture....I would call and see if there is an interest in taking on your project. As long as you are game for the ideas ..with your budget...there may he interest in your project...or perhaps the professors and professionals (since from your geographical area) could make suggestions about remedies you vould pursue to get the best results ..budget conscious, practical, and successful over the long haul...for the dollars you have.