Afternoon, hope the following helps:
MDC-1200 transmits unique identifiers as programmed per radio if selected for BOT - Beginning of Transmission, or EOT - End of Transmission.
The XTS5000 requires feature code H14 - Enhanced Digital ID Display to show radio IDs or aliases for those IDs on the screen of the XTS... which is I assume how you're planning to visually observe these IDs (rather than a console or PC-SDR with MDC decoding). You will not be able to successfully program an XTS to display radio IDs or aliases on the front panel screen without a flashcode that includes H14 in the radio.
MDC is a conventional-only signalling mode. It does not apply for trunking, as SmartZone/SmartNet and P25 trunked systems use two entirely different protocols for unit signalling that are separate from MDC.
Likewise, I don't know whether 'complex' is intended to mean simplex or duplex, but it doesn't matter - MDC works on (well, nearly) any conventional system passing analog FM audio... so long as there are radios that can encode it and radios that can decode it.