Here's an update for the Omega2+. What I did to get the JVM on there was followed the instructions above to use pivot-overlay for a usb drive. Instead of the USB drive I used my SD Card in place. This worked perfectly.
There are many packages that it couldn't find such as unzip and jamvm. After doing some research I added this line to my /etc/opkg/customfeeds.conf:
src/gz lede_packages https://downloads.lede-project.org/releases/packages-17.01/mipsel_24kc/packages/
Once I did that then I ran opkg update. From there I was able to install unzip and jamvm.