To make a future proof solution: I think so.
Using only crypto coins in that fund you already have that solution available.
Are you speaking of the crypto coin index or the attempt to provide “good money” on a blockchain that fails because of the inability to handle stocks, commodities, ETFs easily?
You want to rely on a third party? What for? Does Nulagoon have anything except for BTC and NBT pools available? How to include all the coins you want to? Make requests at Nulagoon? I don’t understand why you prefer using a third party with all the overhead and consequences.
Don’t you think a crypto coin index can be understood, maintained and reported more easily?
If you publish the addresses involved in the index (the multisig addresses holding the coins), anyone can check the transactions and balances on the blockchain.