Seize is very small.
It is basicly a tool to avoid to hold CBDC's which will be provided to retailers.
So low maintenance fee is important,
Residence Mauritius and nationality currently Austrian
Just to clarify, what do you mean by investment fund? And are you going to collect funds from independent third parties (the public/retailers) and manage/invest them?
There are different vehicles available in Mauritius that might be of interest: CIS (Closed Investment Scheme) and CEF (Closed-Ended Fund). I don't know the fees off the top of my head but these things tend to be very reasonably priced in Mauritius.
Seychelles might also be worth looking into. They have a different vehicles available.
There's also some sort of investment license for companies in Belize, but you need to open a local bank account and deposit 50–100,000 USD. Aside from that, the fees are competitive.
Another question is what would be the economic substance requirements for such a fund? Do you need to set up a local management company, appoint "qualified" fund managers, have a local office, or can you run them by another company from abroad? Can you open accounts with regulated brokers in EU/UK/US or will you face the same problems as with offshore companies (need for a director with local residence)? Do you need to give third parties access to accounts?