NISA with IBKR Japan

Hi everyone, I recently made a NISA account with IBKR Japan. However, there is not much information about how to perform specific NISA transactions, I hope someone here can give me some insights.

– In Tsumitate NISA account, as I understand, we usually need to setup a monthly investment up to 100000 yen/month. How can we do this in IBKR? It almost seems like I can buy a mutual fund at any time there.
– Usually the recommended fund for NISA is eMaxisSlim products, but they are not available in IBKR. I saw in this sub that Nikko AM Tracer's MSCI All World Index fund is available in IBKR; when I check, it seems that the fund has changed name to AMOVA TRACERS MSCI ALL COUNTRY INDEX (02312234), is this correct?

– In IBKR, it does not show any market data for AMOVA Tracers fund; we can buy the fund but there is not much information about it. I wonder if it is ok or recommended to purchase this fund for NISA? Especially I read that the fund size is much smaller than eMaxisSlim, I wonder if it is too risky.

– In IBKR we can also buy VT. As I understand, VT will have dividends that are subject to withholding tax, while eMaxisSlim does not, that's why eMaxisSlim is often recommended for Japan residents; However, comparing VT and AMOVA, is AMOVA still more recommended?

For more information: I tried to open Rakuten NISA account, but as I have not stayed in Japan more than six months, the application was rejected (or at least that was the reason I suspected).

Thank you!

by teppeiUesugi