I don't think talking to Leuchars in that scenario would help you at all. They'd phone Dundee and Dundee would tell them to tell you to contact them and, most probably, to remain in VMC.
Dundee's attitude to someone calling up unannounced who's flying VFR but expects to have to fly the IAP will depend crucially on whether they have other IFR traffic. And if they do, the controller will have to work out what to do with you. If you're chugging along at 2000ft and 90kts under the cloudbase, and he has a Do328 expected from the south in half an hour, and (likely in your scenario) the weather's unlikely to allow Leuchars to give the 328 a 'radar to visual', then the controller's focus will be getting the 328 to the NDB at 3000ft to commence the procedure. He would then have to work out if he could get you up to 4000ft en route to the NDB to hold, in time to achieve separation from the 328. Chances are he'd just say remain VMC and remain north of the 09 approach.
NS