I don't know enough to answer those questions CR, but a carefully chosen cross of (97L97 X Opalka) X (Jaune Flammee X Opalka) might have a fighting chance of producing a useful combination. There would be a lot of segregation including some more orange than others and some more indeterminate than others. With judicious selection, I think you might find the intense orange indeterminate paste.
Many of the genes that result in paste tomatoes are located on chromosome 5. This simplifies breeding for paste type.
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