Well using new or by editing wc3 mpq database I can remove all imports from map and just hook them trough that mpq.
But there are around 1300 imports right now, editing paths and just making all that is HUGE job.
And even if by some god only way I do that you will need to download that mpq or replace your old one with new to make wc3 recognize models, icons and other resources.
There is way, but it's not suitable for already created map.
I knew this when I started making map but I decided to make it single because of easier coding, and because I do almost everything alone.