Would requesting a public IP from my ISP allow me to get rid of my Double-NAT problem?

I have spent the better part of this week combing through forums looking for what exactly I need to do here.
So I live in an apartment complex where we are all provided internet via an ethernet port in the wall. I'm assuming these all lead to a central modem / router setup by the ISP or apartment IT. I purchased my own router (Linksys EA6350) so I can control my connection and devices and what not, as most people here do. However, after opening ports, setting DMZ, toying with UPnP, everything the forums recommended, I've come to the conclusion that the ISP must not allow port 32400 at their level through to my router. The WAN ip is different than my LAN ip as well (double nat, I believe?).
So what I'm asking is, if I were to call my ISP / complex IT and ask them for a reserved IP or something with the necessary port open, would that let me remote connect to my plex server? I haven't set my router to bridge mode because I don't want my devices so unsecured.
Any help is appreciated. Thanks.