The investor visa has been cancelled in HK whereby you could just deposit $1.2 million into a bank and you got your residence in a couple of weeks. What you're talking about is employment based immigration. It may work or may not but as a trader you gotta pay taxes on your trading income. It used to work in Singapore as well btw, I'm not sure what's the case now. Although in the case of Singapore they granted you an employment based visa if you were a director in your own company with a high salary thus you paid relatively high taxes.
I don't know how much time did it take in Malaysia but presently it's between 3 and 6 months. Still, it not bad.
When it comes to foreign income (what is not foreign when you're trading within Malaysia) then you better declare it because they gonna see it. I know you like to ignore the effects of the AEOI but whether you understand it or not, it's working. In other words, no matter what you do, the Malaysian government knows about all your bank and brokerage accounts from 2018 so they can easily see if you're trading and not investing. Indeed, if you don't make much then they're unlikely to bother you but this doesn't mean that you're within the rules.
Btw even the dumbest tax advisors knows that if you're trading (trading!) on the money markets then it's not foreign sourced and it's taxable in every single territorial tax country. If you can get away with it then you just don't make enough to get noticed. However if you get audited then it's time to find the nearest church to pray.