Well, it's worth trying, right?
The output signal provides constant sync so the display never glitches.
Built-in Time Base Corrector - Stabilizes video sources with unstable sync.
Built-in ProcAmp - Color, hue, sharpness, contrast, and brightness are set individually for each input.
My only experience testing a scaler is the Vidikron DVS3500 (rebadged Faroudja DVP3000) which is 10 years older than your Kramer. I think it received rave reviews in its day for its deinterlacing and scaling, but I found it to be pretty crummy for use as a proc amp + TBC. Just because something outputs contact sync doesn't mean it will do a good job decoding unstable sync from the source. It internally dropped lots of frames from the start of a tape that other devices were able to display just fine. And in turns of proc amp, its luma dynamic range was too small, so super-brights got clipped.