One interesting reason: I've seen fics with Danny as ancient and space and doorways. Can you say basically god of stargates? Sure, there's already a Janus in SG canon, but I haven't seen SG:A so I don't care. Canon is a suggestion only, as always.

One dumb reason: To let Danny be a little shit about name claiming because sure, they've got a Daniel Jackson, but he's Daniel, Jacks's son.

(And the sideeyes SG1's Jack would get at that.)

Don't really have a plot in mind, but did have the thought of what if part of the reason the goa'uld do what they do to stay immortal is because they're fucking terrified of dying and facing the afterlife? Aka the infinite realms. Some ancestor of theirs pissed off a powerful ghost. Maybe Danny if many thousands of years old!Danny, maybe Clockwork if not.

In the former case... someone took Jazz as a host perhaps? That'd be about the biggest mistake to take in the case of Danny's revenge.

But pissed off Clockwork would also make anyone scared to die and face him. Since he doesn't leave the infinite realms.