Morphology: replace pixel-pattern by another pattern

[Erik]

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I'd like to use morphology to this replace BW-pattern:

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... with this pattern:

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The parameter below wouldn't work in my case, because I always need to check for black-pixel-neighbours on the left side, as given in the example above. The parameter cited below would also change this pattern, which is not what I want:

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-morphology thinning '1x5>:0,1,1,1,0' \

[snibgo]

You've defined a kernel of width 1. A width of 2 would seem more useful.