Today I have without thinking snapped a photo of my Bitcoin wallet seed with my 35mm camera. I have some important shots on the roll, so I can't just pull it out of the camera (which will destroy not only seed, but the rest of photos as well).
is it colour or B&W film?
you could actually invest in developing it yourself, I used ro develop my own
colour and B&W film but you would have to buy basic equipment.
This all depends on how much the wallet is worth.
or move all coins to a different wallet.
If it is B&W, you could develop it yourself indeed ... you might have found a new hobby
(I wouldn't do it with C41 process color film though).But seriously, I would not take any risks. Does your camera have the option to double expose? Then you might want to try that for that frame (but analog film has quite some tolerance for over exposure). The safest option indeed is change the seed (if possible) or move the funds to another wallet. Even if your film goes into an automated process, there is usually a manual step afterwards (quality control), so you still run a risk.