I would not recommend planting Dissotis rotundifolia as it is considered an invasive plant in Hawaii. It easily spreads and will cover low shrubs and grass. It's most serious threat is that it could easily escape your orchard and invade forest or someone else's property. It's hard to get rid of once established. Please click this link for more info on its invasive qualities.
Additionally, its aggressive growth could mean that it will strongly compete with your orchard trees for resources such as water and nutrients.
Please consult your closest extension office for recommendations on suitable ground covers for your orchard. There are several possible cover crop and native species options.