I'm in the same boat as you are, but with an EX37 2013. No NAV, no bluetooth streaming, no AUX ports. Something I never thought I'd have to look into when I shopped for a 2013 Infiniti. :( My mistake, I took it as granted since most reviews online showed these cars with similar years with an AUX port.

Most of the solutions are expensive (and also hard to find) if you insist on keeping the steering controls. I thought about replacing the whole screen with an OEM touch screen, but that would probably mean to replace the whole head unit as well. Probably around 500$. The other solution is the one you mentioned, the GROM VLINE2, but it comes up to about a 1000$ with fees, shipping and taxes for a Canadian like myself.

Oh, and I've also looked into aftermarket head units, since a lot of cheap Android ones are less than 300$, but I haven't figured out a way to make it work without losing A/C temperature display, or even the OEM backup cam on some models.

For now, I use an FM transmitter but I do lose steering controls. I've tried 2 so far, both from VICTSING on Amazon. The first one kept disconnecting, the second one is better so far, but I get hickups and also a hissing sound through the speakers. We are far from a perfect solution. I decided to combine this with a bluetooth media control button but haven't had the chance to try it yet. Here's the link: https://www.amazon.com/Bluetooth-Tsumbay-Assistant-HandsFree-Navigation/dp/B07MLZ3B7W/

Let me know if you ever find something that works better without costing a thousand dollars, it's been driving me crazy for the past weeks.