At this point, if you really can manage 2-3 new block font sets (I know folks have concerns about too many blocks being added), the POIs are going to look bananas good. Right now that stuff is standing out REALLY REALLY hard, but even the slightest amount of variety would go an extremely long way towards fixing that.
Better yet, 2-5* Large Signboard blocks maybe? Just a bigger, more formal version of the writable signpost, with a choice of maybe a dozen fonts and pickable textures for both text and background? Absolutely would be more work but could revolutionize POI appearance across the game and actually lower block counts. Especially if you can decouple characters from being forced to always be 1 block in size.
*Okay, maybe more than 5. Would probably need 1x3-1x9, and maybe a 2x6, 2x9, and 2x12? Would be 10 blocks in total, maybe a couple more sizes for a dozen.
Even just a more modest implementation with only a handful of larger and more formal signposts would still have very broad use cases. And the game already has fancy signpost blocks in the traders. The difference here is so stark!
Not expecting anything for 1.0, especially since a large number of POIs would need retrofitting (simple, but tedious). But the effect would be dramatic and very wide-ranging.