They can play in this Guwahati Stadium where North East United plays. It is recognised for AFC Purposes. By the way, think about AFC Cup, not AFC Champions League. ACL qualification is very tough.
AFC Champions League is beyond the Indian Super League teams even... do we really expect them to beat an A-League side (keep in mind, in the Champions League, the ISL team would be forced to go by the AFC squad rules).
ACL attendance will come down with more Arab nations participating, Iraq and Syria which have good support base will unfortunately will play in front of empty stands in Dubai etc. Dont have to say about Kuwait and Bahrain. :-<
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By the way, think about AFC Cup, not AFC Champions League. ACL qualification is very tough.