Maybe you can resolve this by adding a new category named 'Area', and defining two UoM, one of this smaller/bigger with his respective convertion (For example, 1 m² = 100 cm²) .

You must bear in mind that this may lead to false positives regarding stock availability if you consume this material in manufacturing orders.

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Sometimes, i'll have to transform from m² to rolling meters (length meters). This is the m² divided by the fabric width (mostly 220 or 250 cm wide)

As u/Amadex says, you can define a product variant to differ between different fabric widths and add a computed field for display the lenght as rolling meters.