Yes. If you use like Sunway money cost is I think fixed at RM1.00. But if you use like instarem, it's based on certain percentage. I have not test whether instarem cost is the same. This is because they are generally more expensive than other platform (I noticed it from last year)

Your choice. For me once I have minimum RM12k I convert and never look back.
You can consider using pseudo bond like stocks overseas to park money. One very good stock I use is parkway Life REIT. This is because IB does not give any good interest at all.

Depends on what you want. If you want returns arkk or arkw.
If you want biotech ark genomic. But can't go wrong with ark.

I won't recommend rm1k/month DCA via TSG/IBKR into ARKK. Even if you're only making 1 trade per month the fees will still add up in the long run. Take for example:
IBKR-TSG
- every month RM1000 is allocated for overseas
- convert MYR into SGD via TransferWise (approx. ~0.6% transferwise or ~RM9 gone, based on google rates vs. actual amount received via transferwise),
- commissions to do spot-rate exchange within IBKR (2 usd per conversion or ~RM8 gone)
- trade commissions (approx 1.5USD per trade or ~RM6 gone)
= basically RM23 in fees per trade (approx 2.3% in fees)

Via TSG-IBKR you'll be paying (2.3% upfront "SC equivalent" + 0.75% annual mgmt fee), whereas from FSM you'll get (1.5% upfront SC + 1.85% annual mgmt fees).

You'll have to really do some maths and compare it upfront before making that decision to DCA via international brokers (unless of course if it has 0% commissions) - every amount will yield different result/savings. Take another scenario as an example:

Stashaway
- every month RM1000 is allocated for 30% Risk index fund
- convert MYR into USD (0.1% spot-exchange rate or ~RM1.5 gone. super rough calculations)
- buy into various ETF's with 0 commission
= basically RM1.5 in fees, maybe slightly more but yeah approx 0.1~0.2% per trade?

General rule of thumb - the higher the amount you transfer out (in a batch) of Malaysia, you'll achieve better results due to savings on fees/commissions. Hence why most opt to only transfer when they have more than rm5k (or even better, above rm10K-30K) to achieve economics of scale.