AVIsynth sharpener suggestions

[spicediver10191]

I have a slightly-less-than-standard-definition clip in Premiere (a 24p project) that needs some sharpening to better match it with the surrounding clips which are all normal SD resolution (720x480).

Premiere has an Unsharp Mask filter which gives me quite decent results.

I'm wondering is there an AVIsynth filter (for RGB) that might do it better?

The clip is a facial closeup, with very little movement. Aside from the resolution, it's from good quality video.

Any script suggestions much appreciated.