Too many of the brands mentioned will only be bought by very few people.
How's this for a suggestion:
Most people are afraid to order from overseas on their own.
Guitar77 could offer the service of being the middle person.
Collect a deposit from the person who wants to order a certain item, then order the item which would be shipped to the shop. The person then comes and collects it and pays the balance.
This way you can bring in lots of brands without dealership and without a load of unmovable items in the shop. Of course, you have to let the customers know that you are not a dealer in the transaction, only the middle person.
This could aid the organising of Mass Orders from Ishibashi and things like the tremol-no too.