It’s a wild idea, but I thought about using a hex flower as a threat map. Especially for a fantasy, OSR-informed game, for a cool feel.
A couple of things I considered:
Dynamic hexes: when you place a threat on the map, jot an arrow to where it will move next as things happen. If the characters or another threat is there, well. Threats can clash, or the threat finds the characters.
The characters also move around the map. Either you add more hexes and the map expands (tricky but doable), or not, the characters don’t have to necessarily stay in the centre. When they decide to move onto a threat, move them on the map.
Anyways, Just thoughts. No idea if I will actually use it but it’s been an entertaining idea.