You can conver using djvups (it's fast) and than ps2pdf (it is very, very slow, couple hours). Another problem is size of pdf files converted from djvu (5 mb djvu file goes to ~80mb pdf file, and iliad slowly reads such files). Another solution is using vncviewer,
https://www.mobileread.com/forums/showthread.php?t=14148.
You run vncserver on your pc (enable multiple login is usefull) than using vncviewer you first login from your pc, open djvu viewer and document you want to read (you can do this from iliad but it is much easier to do it from pc), and that using ported vncviewer login from iliad and read document. You can move pages using stylus. You can use this solution for any application. I suggest using lan connection because of battery.