In reply to Question for Polish speakers: help with ligatures:
Definetly. If you plan nesting letters, there should be no ligature here. The double ł appears in few foreign words like mułła (mullah) or the above mentioned Lithuanian names. The only exception are forms of the past tense and conditional mood of one verb, mleć (to grind), which seem to be a linguistic ballast, and aren't practically used in daily language. There, in plural, the łl appears. It appears to mark a difference between masculine and feminine forms: -łli -> m., -łły -> f. So nesting the second letter there, would be a bit misguiding. But in the case of the suffix pół (half, półlegalny = semi-legal) - where one probably can create much more compound words than those few "łl's" we are familiar with - crossing the boundary would be purely distructive.