The least used consulate ally for the japanese are the dutch, as they do not synergise very well with the common Japanese strategies. How about creating a strategy centered entirely around them ?
This build requires :
Exploit the synergy between the card good faith agreements anf the toshogu shrine wonder to boost your economy with an early bank, then switch alliances to exploit the discounted consulate techs.
Perform a consulate opening. However, instead of allying with the Portuguese, you ally with the Dutch. Pick up a wood treasure as fast as possible and build the shrine. You do not need to wait for the alliance to be active to build said shrine.
Assess if your opponent plans for agression (no house in base for example).
In transition, with the 300w, build a market and a trade post. Then, purchase wood 3 times using the coin you have accumulated thanks to the Dutch alliance. Buy the first food upgrade at the market and bank 200w. If you have not already, ship good faith agreement.
Build a barrack with the 200w you have banked and purchase the discounted bank at the dutch consulate. Train ashigaru in your barrack. On top as acting as a deterrent, producing ashigaru gives you XP to speed the next shipment. The build XP from the bank will allow you to ship something. What to ship depends on what your opponent is doing.
The rest of the guide is written assuming you allied with the Spanish.
You have your infrastructure (bank+church) and your crates/trade routes are boosted. The long term plan is to leverage your crates as much as possible, either in age 2 or 3 while pressuring your opponent. Break alliance with the Spanish and enact isolation. Buy the discounted military rickshaw.