No we do not offer this as a service.
The eyelets are fixed directly into the material of the shade sail seam, and so need to be placed at regular intervals to make sure the weight of the sail is distributed evenly. If the eyelets were placed in the corners only, the weight of the sail would be too heavy and the material around the eyelets could tear or become damaged.
For corner installations, you would need a sail with concave edges and D rings. The D rings are attached to the sail by thick webbing, which is sewn into the shade sail seams, and allows for the sail to be pulled in each corner and tensioned. The concave edges are not as deep as our ready-made shade sails, and you can see some examples of this in the pictures on our Made to Measure page and Customer Gallery - DIY Made to Measure Shade Sails.