This seems like a waste if it built on the traditional fiat system. For one it not trustless in the first place. Spreadsheets are used by finance as you can view the history of changes. You can pseudo verify. Nonblockchain version? you mean by cloud? A registered company as you're using fiat that deals with private loans would serve much better. You can view changes and/or trust the fiat license they have.

There might be a small use for a blockchain version of this maybe more laxer rules but as this a minor case their is less incentive to be made. And what would the dev gain from this a cut of the tx? How would they enforce this via smartcontract if it using cash/bank accounts? A max a fee to register to must be made but then people being people don't want that fee. A donation fund could be made but those won't provide security long term.
Another thing is the oracle feed? How you can decentralized something that requires trust? You can distribute the info to diff people than the privacy goes bye bye.
Also time stamping is also another issue that goes hand and hand oracle.
As a manual input must be done. A blockchain won't be this helpful. You could do an opentimestamp and use a centralized database at the same time. The power,ease of a centralized database with the verification and secrutiy of proof of the blockchain(bitcoin?). This might what your are looking for. Not a full blockchain but a service that uses a blockchain. I believe it was once used/made but no one ever used it...

It a sad thing. You think one thing good use for blockchain then you look deeper into it. Maybe it the fiat is affecting how you do it? Maybe it the scaling? Maybe the code? Maybe it just dumb? Maybe it...?

Another full blockchain thing you could do is:
Stablecoins maybe you using TUSD which you deposit your fiat and then using a private smart contract code(being worked on not done yet)and then using a dpos/staked oracle to verify and store time. It won't be nice and might seem like a waste of resources but this "full" blockhain could be done.

(Sorry for the long comment)