It's too bad you didn't stake another address before you changed your password, but eh, water under the bridge now.
How about this scenario: Stake an address with some funds in it, send the funds to your coinbase address, then send back to your new staked address. Even if coinbase shuffles your output address if it's all done within a few minutes and it's the same amount minus fees, that's fairly solid evidence it's still you.
ETA: beaten to the punch by iasenko.
Yeah, I will have to try both of those.
I felt the urge to change my password because it was pretty low on entropy; its solid now.... all the issues on the web with database breaks, microcode bugs, etc... Just gotta stay safe.
Ill use one of my old vanity addresses; send .005 or something to it; and start it from there.
But this means ill have to get a wallet online; and that will take a separate machine at my internet hub. No way can I do it from home; I use a cellular link with a personal VPN to my hub. The machines at that hub aren't worth of trying to get a blockchain on it; (space and other reasons).... so ill have to figure out a gameplan.
This seems doable; and If I TX myself .001 to 1PHS; Ill see if it stays there just as a test. If it does; I can TX a requested amount to secure my newly staked address.