Delay comes from "de-", Latin "off/dis-", and "laier", "leave".
So, you could indeed have "prelay" in the sense you describe, as well as "forelay" or "forlay" with the Scandinavian and Anglo-Irish suffix.
Both terms seem to exist, however, with totally different meanings. ("Forelay" according to the 1913 Webster means or meant "laying down beforehand", and "forlay", an obsolete