I'm an avid advocate for any PLAN destroyers which precede the 052Cs to be MLU-ed to become essentially large frigates or frigate leaders. This includes the 051Cs.
If the 051C DDGs (i.e. #115 and #116) can be MLU-ed with Chinese systems in the coming years, then hopefully one major aspect of the MLU would be swapping out those 8-cell S-300 rotary launchers and replacing them with the H/AKJ-16 VLS cells for the HHQ-16s.
View attachment 128560
The two rotary launchers in front of the bridge can be replaced with two 8-cell VLS modules, while the four rotary launchers in front of the helicopter landing pad can be replaced with four 8-cell VLS modules = 46 VLS cells in total.
Besides, those eight YJ-83 launchers can be replaced with eight YJ-62 launchers.