Hello,
Unfortunately there is no easy way of converting into .PSV format. The way the header is generated is not known (unless you're a sony developer).
The maker of Black Chocobo wrote a guide on how to do it here:
http://sourceforge.net/p/blackchocobo/wiki/FAQ/#psp-and-ps3-saves
This requires some stuff you might not have, but you don't need black chocobo. Thus step 1 in the "The HomeBrew Enabled Ps2" Method will be different.
Step 1 in Memoria: Open the file and right click the block you want to convert. See Block Info and note Product code and Game ID. Now right click the same block and select Export -> Single Save Format. Filetype to export must be RAW Save. Name it as Region Code + Product Code + Game ID (US Region Code is "BA"). If product code is "SLUS-01251" and ID is "00000-00" then export the block as "BASLUS-0125100000-00" (without quotes of course).
The CFW PSP Method:
I may be wrong, but all you seemingly need to do is to change the extension from .mcr to .VM1 then do the rest of the stuff.
Good luck!