Spanish apparently doesn't have an adverb for "write" either

Having studied - and used - Spanish for a while now, I recently returned to a question that stumped me a few years ago: what is the adverb of "write"? Does Spanish have an adverb for write?

First a short lesson in Spanish grammar. Adverbs are (for the most part) formed from adjectives by adding the suffix -mente, which means something along the lines of "in the thought of the thing" (being derived from mentis, the same Latin root from which English derives mental). Therefore, the Spanish equivalent of verbally is verbalmente (which is formed from the adjective verbal and the adverb-making suffix -mente).

In other words: verbalizar (to verbalize)  verbal (verbal)  verbalmente (verbally)

So I thought that all I need to do is determine the Spanish equivalent of "written" and just add "-mente" to get the Spanish adverb of "to write."

In other words: escribir (to write)  escrito/ta (written)  escritamente (adverb of write)

It seemed to easy. It seemed so simple. It seemed so obvious.

But escritamente doesn't exist. Unfortunately.

What's the solution? To do the equivalent thing as in English: use adverbial phrases.

Ergo: escribir (verb)  escrito/ta (adjective)  por escrito/ta (adverbial phrase).

How... deflating.