Although the 86U supports 64-Bit Entware, it runs the standard 32-Bit that the 68U installed just as well, with no performance downside.
Plug the USB Device into the 86U and then run the amtm install command from the website:
https://diversion.ch/amtm.html
In amtm, select to install Diversion.
It'll offer the options to restore the previous version or a fresh new install. Select to restore.
Everything Diversion related will be as with your old router.
Then select to install Skynet in amtm, it will find the previous installation and use those settings too (I believe).
I'm not sure about YazFi, it stores its files in jffs so you'll have to reconfigure that during installation.