You can probably do it now, yeah.
You can post follow up questions here for no cost, or if you want I do some detailed consulting via video chat
https://www.gocurrycracker.com/consulting/Generally speaking you can spend as much as 4% of your starting investment portfolio each year, or ~$37k, adjusting for inflation each year. $22k is much less than that so you would have significant margin. If you have sufficient work credits to get SS in the future, that is an additional margin of safety. Since you would be retiring extremely early, a maximum spend of 3% is "safer" (your target is currently ~2.5%)
https://www.gocurrycracker.com/what-is-your-retirement-number-the-4-rule/There are additional risks for living and spending in a different currency than your portfolio, e.g. your income/capital gains in USD and your spending in VND. Currencies can go against each other causing a significant increase in cost of living. Developing economies can also have more dynamic inflation.
With the calculator you are using, there are a couple things to watch out for:
1 - you have it configured for ongoing income
2 - fixed percentage portfolio growth doesn't happen in the real world - use "historical cycles" to get a better picture. This uses actual historical year-to-year return data so you can see what would happen in the worst historical examples
A better tool for #2 is cFIREsim,
https://cfiresim.com/
