Surgery for congenital ptosis is always harder than for a regular ptosis with good levator function. You know this since you have had multiple surgeries to try and fix your lid height. People with congenital ptosis usually have little or no lid crease. When you do a frontalis sling, there is no way to try and make a crease. Sometimes an incision where a crease should be can help create a small crease, but this doesn't always work. Luckily you have a good lid height which is the most important issue here.
This is a difficult question. The first think to understand is why you have ptosis in the first place. Is it congenital? acquired from a trauma? You mentioned that you had a silicone sling frontalis surgery...which is often a last resort surgery if all other options are failed. It may be a good idea to upload some photos. It is possible to redefine your crease (as your surgeon had mentioned), but not without an incision. To answer your question, it is very possible to reconstruct the crease by adhering the skin to the tarsal plate. In these scenarios, I place both an external set of sutures, and an internal set so the skin adheres.