The concise substitute for 'in an easy way' is 'easily'. In order to save words, can't 'ly' be allowed for the comparative and the superlative degrees as well? I have already seen instances like 'worstly'. After all, language and the dictionary are always updating, and through us.
"Easily" isn't really a contraction of "in an easy way" - it is actually an adverb, i.e. a word which describes a verb. Though some adverbs do change form when used in comparison or superlatively, in general they take the modifiers more, less, most and least.
Where the meaning permits, adverbs may undergo comparison, taking comparative and superlative forms. In English this is usually done by adding more and most before the adverb (more slowly, most slowly), although there are a few adverbs that take inflected forms, such as well, for which better and best are used. - Wikipedia:adverb
As such, your "easily" would be compared or used in the superlative by saying "more easily" or "most easily".
"Worstly" is incorrect, as "worst" is already an inflected adverb and doesn't require the "-ly": Bad, Worse, Worst. It would not really be applied to a verb.