No easy way I can think of off the top of my head bro...
You could try miwi (cydia app) to put out a wifi signal
Connect both your iPod and a pc to that wifi
Set up some sort of server to host some add on pdb packs on your pc
Go into that part of the mission downloads part of WI where it let's you enter the link to an online pack
Then find the link to one of your hosted add on packs on ur pc and write that in.
Iv never tried this but you could give it a go!
Assuming you mean your wifi router is malfunctioning or something other than ur iPods wifi this could work...