I think you have visited Nagaland.Am I wrong?
Of course Mokokchung is in Nagaland and you can't enter there without having the ILP. In any case, Mokokchung office issues ILPs that are valid only for Mokokchung and not for rest of Nagaland. What you can do is to entail services of some travel agents who can get you the ILP over post/courier (provided you have some time before you start) for some fee. Some of them are:
Guangta Travel Partner's
Address: Half Nagarjan, Bank colony, Traffic Point, Dimapur, NL 797112
Phone:090 19 040700
Alder Tours and Travels
Address: Opposite Second World War Cemetery, Blue Bayou Building, National Highway number 39, Midland Colony, Kohima, NL 797001
Phone:094 36 011266
P K Travels
Address: Jain Temple Rd, Marwari Patti, Dimapur, NL 797112
Phone:03826 231 619 ext. 231623
Travelzone
Address: Ground Floor, Child Protection Society Building, Opposite DCC, Near SP Office, Officers' Hill, Kohima, NL 797001
Phone:096 12 714131
Sanny Tours & Travels
Address: Near Oking Hospital complex,Phool bari,Kohima, National Highway 61, Midland Colony, Kohima, NL 797001
Phone:098 63 071442
You can also call at the numbers of office issuing ILP at Kolkata (nearest for you?) and ask for the procedure if it can be done remotely.
And No! I have not visited Nagaland yet, it's on cards for next year perhaps. This is the reason I'm also researching.
