Default Wireless SD Card reader as actual storage?

Hey guys, for ages now I've been looking at ways to wirelessly, or at least cleanly upgrading storage on the DNA, considering it has no SD card port, and I've been trying to stay away from Wi-Fi SD card readers considering that I know that if I'm on the road, I wouldn't be able to use internet considering that if I'm connected to the Wi-Fi SD card reader's hotspot, then I'd lose connectivity from LTE.

But, this product here interests me, http://www.kingston.com/us/wireless/..._readers#mlwg2 I saw some videos of it on Youtube playing back 4K videos instantaneously on an HTC One M7 with no lag, quality degrading, or anything(https://www.youtube.com/watch?v=GUGSKHQvtyU#t=332), it seems like a really nice product for storing music, hotswapping roms and what not, but, problem is, would there be any way for someone to actually download stuff to it like an actual means of storage?

I know about OTG cables and flash drives, I already have one of those, but I don't want to have this cable just dangling out of my phone as I'm gaming(assuming you can install apps to OTG storage) or listening to music. My question is, is there anyway to get these types of products to show up as ACTUAL SD Card storage in Settings? Or maybe there's some type of bluetooth SD card reader or so that could do so?

If not..my last resort is to actually use one of these things, but another problem is being away from Wi-Fi again. Is there any type of Xposed Module or anything of that nature that I can use to be connected to WiFi, but to use LTE connection instead? Thanks for reading and responses.