Finally found an OPTIMAL way to move money from US to SG

I have a significant amount of money tied up in my Citibank USA account. 

I have always wanted to regularly transfer money back into my SGP accounts to do DCA, but it took me quite some time to find the optimal method.

Below, I describe the money transfer patterns I found and the pros and cons of each, and the last one is the one I find most optimal by far. 

At the beginning, I transferred the cash into Singapore using a traditional method:

Pros of the above method:

• No fees incurred when transferring from Citibank USA to Citibank SGP

Cons of the above method:

• USD is converted to SGD in Citibank, subject to the bank's exchange rates, which is not ideal
• SGD is further converted back to USD, again subjected to IBKR's exchange rates - better than bank, but still not ideal.

The thinking is that: wouldn't it be nice if I could get USD into my IBKR USD account directly, without having to incur the exchange rate fees? 

Enter Wise.

Pros of the above method:

• No exchange rate fees incurred, since all in USD throughout

Cons of the above method:

• Incur Citibank fee (25 USD) and Wise fee (6.11 USD + 1.13 USD)

However, since the fees are fixed, there exists an amount at which the above method is superior to the Traditional Transfer Method. 

Based on my calculations, as long as I transfer >16,000 USD, then even though I incur the Citibank and Wise fees listed above, it still makes sense because the Wise exchange rates (USD to SGD) are better than Citibank's. 

This brings about another issue: since I am doing DCA, there is a large amount of USD in my IBKR account that just sits there and does nothing.

Enter Chocolate Finance.

Instead of letting the USD sit in IBKR without earning any interest, I can move it first into Chocolate Finance USD account. Chocolate Finance USD account offers interest rates as such:

• 4.3% p.a. on first US$20k
• 4% p.a. on next US$30k
• Above US$50k target 4% (not guaranteed)

Then, when I finally need the USD to invest, I can move it into IBKR USD account anytime.

The only issue is that I have to incur Wise fees of 10.38 USD for transferring an amount of 7,500 USD from Wise into DBS MyAccount.

How long do I have to hold this amount in Chocolate Finance to make back this 10.38 USD? According to ChatGPT, it is only 12 days!

Sounds like a good deal to me. 

What do you think? Do you have a better method?