Hacking Transfer games etc from Updated Vita to HENkaku Vita?

[nanova]

I'm a newbie when it comes to Vita hacking, as until recently I had almost no interest on homebrews.
I'd like to use HENkaku mostly for VitaPad, RetroArch, Moonlight and eventually fan translations. I still want to support devs and buy games and DLCs, but for that I need PSN access.

I already read the stickies and, if I understand correctly, the only reliable way to buy games is to use a PS3 and the QCMA trick. (Yes I know that the latest HENkaku build has PSN access, but I'd like a safe way to connect to PSN)
Then I read this comment by zeroba:

It's alright, I just turned my second vita into a PSN slave and use that to backup my games then transfer them to my other vita via QCMA on the PC.
Though, if you happen to figure this out, perhaps it'd be nice for people who don't have two vita's lying around but want their psn games.

from this thread: https://gbatemp.net/threads/downloading-games-on-ps3.438950/

Since I don't have a PS3, can I buy a second Vita, keep it updated and buy games and DLCs on the new one, then transfer those to my old HENkaku Vita?
Is there any disadvantage compared to the PS3 trick?
Are DLCs, updates and game saves transferrable?

I'm sorry if it seems like an obvious question, but I couldn't find a clear answer.

 

[metroid maniac]

That should work.

The only disadvantage I can think of is that you can't use this to activate your HENkaku Vita in the case that it becomes deactivated and you don't have a backup.
To be honest this is probably safer than using a PS3 because your HENkaku Vita might never be connecting to the internet or PSN at all.

Also, instead of buying a second Vita consider buying a PSTV. Chances are it will be cheaper for you.