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6.0 and updates for 5.0 and 5.5 allow user to use feature "derive font from default font". But this possibility is missing in property TitledBorder where you are working with font too.
The implementation of relative font for TitledBorder was skipped/postponed on the purpose, not by accident (e.g. this issue is enhancement, not defect) because it is more difficult and uglier. But I agree that we may try to implement it for some future release.
See TitledBorder.getFont(Component c) how the default font can be determined. Quite complicated...