I believe you said, “for now, you can only keep 1”. (For now...)
You also stated, ”you have an unhealthy emotional attachment to the 450” or something to that effect.
That’s the hard part...the attachment, and I get it. I’m that way with my stupid little CL77...it was a labor of love, but she stands idle against the 750 and the HD. However, they are all fun in their expectations and ranges of performance.
If it were me, and I could only keep one, it would be the one which still played into my vintage bike liking and gave me the most versatility. City, highway, power, looks etc. My vote would be to keep the K and start the divorce proceedings, and it ain’t gonna be easy.
Or- a few simple games of eenie-meenie-minee-moe would do the trick!