What about refurbishing the ASMD masts from the ANZACs? The combat system is comparable, but don't know about weight and stability. May need additional consoles.They were for ESSM, and are certainly tactical length, so presumably they would be interchangeable. Installing them on the LHDs might be quite a good idea if there is space and weight available, although you would need to wait for the active missile if you didn't want to have to install illuminators as well. Mk41s need an installation jig to make sure they are installed accurately.