Are there any known ramifications to manually inserting a record with a primary key that once existed but was deleted. Said primary key existed only in one table, and is not referenced in any other tables.
Are there any known ramifications to manually inserting a record with a primary key
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Not really.
But generally it would be a bad idea because of history tables. At some point, it did exist and will be logged in most systems.
You may also have an external trace: a backup, a copy of the database, some data on a linked server.
If you are just filling gaps in an autonumber or identity, then this is not a valid reason.