If you have a document clearly stating this future income from a reliable source and money in bank or stocks, etc. I would try to submit it.
I didn’t have the required documentation and submitted an executive summary of the situation along with pertinent documentation. They asked for my tax returns… which I don’t have to claim (weird situation)so I gave them my last return from 2018 and they gave me the visa. The agent commended me on putting together a clear picture of the situation.
James Stuart Neill I did this exact process when I left the country before Covid and removed my funds. When I returned a couple months later, I deposited the money into a new account because I had closed the old account and they wouldn’t let me reopen it. I used Best Friends Visa in CM for that one year only. I had no issues renewing it on my own the next year.