Ph.D. admission with funding from current employer
Two things came to my mind:


Self-Finance and End Results: First thing first, broadcasting to a department that you have the money and you need a PhD position might not be a good idea. This is because just spending the money does not give you the PhD at the end. You need a good supervisor and research group to do the research. Throwing money at situation works in business, and might work in academia in other situations (e.g., buying equipment); however for your own PhD I would suggest to carefully pick and choose. You might spend the money and not getting the results at the end.  
Guidance from supervisor: Your target is to do a PhD (with a one supervisor or two) with your company's funding. There are some issues here, for example, who is actually doing your implementation work (e.g., your coding if you are in a computing field) if you have a team behind you? I would suggest to find an academic first, and talk to him/her about this situation. Also, this way you don't go under the university's pressure and some non academic management to throw money at the research, because this will be hopefully sorted and guided by your supervisor(s).