My rent per month is about 336USD (live alone), I spend about 400USD per month on foods, and that's because I'm too lazy to eat out that I basically Ubereat everyday. (If you choose Taipei, the cost would be a bit higher, The point to live in Taipei is the convenience and it's more approachable to newcomers)
There's a lot foreigners in Taiwan, so it won't be much trouble to blend in I guess.
We have a excellent control over the pandemic, we welcome you as long as you respect the rules and are willing to self-discipline (especially in this pandemic).
Here I got a Discord server that a lot of members are foreigners in Taiwan: https://discordapp.com/invite/zFBqpET