to the forum.
In answer to your question it is very straight forward converting from auto to manual, however it can be very expensive and time consuming so may not be cost effective for you I am afraid.
Is it a JDM that you are after or would a UK 350 be acceptable?
If the latter there are plenty cars out there and it is just a case of waiting until you find a clean low mileage example, but you may have to travel.