Just create a Custom Wallet, type “SOL Ledger” and you will see a link at the bottom to create a custom wallet and then upload the CSV file. This is pretty straightforward and you guy’s don’t need to wait for the automated syncing. When Koinly supports SOL addresses to sync automatically then you could delete the custom wallet and re-sync. This is so simple and nothing to worry about Koinly not supporting SOL at this moment of time.
This is what I have been doing for both SOL and AVAX. You can even use the Simple Format CSV file.
With AVAX, I have transferred the coin to my Ledger address from the exchange. Then I have created a CSV file using the sample Simple Import CSV. I have then created a custom wallet for AVAX and uploaded the CSV. It is all recorded properly in Koinly.
Please go through the Guides on how to use the Simple format. There are plenty examples. Once you go through these guides no one will complain about not supporting SOL or AVAX.