Unfortunately the Philips 80C552 is a superset of the 8052. It has many additional features like two additional I/O ports (P4 and P5) and 10-bits A/D converter, as well as many additional SFR registers so it is not than easy to use MCS51.DLL services. Though in the past I have used some sub-classing techniques in order to extend dlls services for Windows programming, I'm not sure it will works fine for "COM" like dlls.
You could incorporate in 80C552 library the MCS51.DLL, but you will not able to use all additional features and you would limit your simulation to 8052 classic features only.