Since I've read some negative feedback about removing PSV_UPDATES support (mostly due to some technical issues with PSTV that have AntiBlackList installed) my suggestion is to add new option "Download Latest Patch" (Or "Download X.XX Patch" if you parse it before showing per titleid options, and do not display this button at all if there is no update available.) on Game View Window [Right below "Download game"]

Here is the idea of how it would work:

1. Have new config setting with vita HMAC key. [Or just hardcode it, up to you.]
   Note: We'd have to rely on user's config because right now I have no clue how to extract hmac key on the actual console.
2. When Game View Window is triggered use code similar to >>THIS<< to get the latest hybrid package update link and update version. If there is any update available, display "Download X.XX Patch" button right under "Download Game", if not -> do not display it at all.
3. When button is pressed download and extract the patch in question to /patch/GAMEID/
4. Promote Patch (for example like >>>THIS<<<)

Cheers!