Go for the widest you can go.
The tyres will stretch a bit making it easier to mount/remount when necessary.
I'm going to fit my mudguards and if there's still a bit of clearance I'm tempted by 26mm gravel kings. If there's no more room I might have to stick with the 25s and hope they stretch like you mentioned
25mm on wide rims is plentiful, I wouldn't worry about that really.
@mrJL started
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Go for the widest you can go.
The tyres will stretch a bit making it easier to mount/remount when necessary.