you could try buying a cheap macro/closeup filter set and see if one of them will help. prob a lower strength one
Just an update on this, in case it's ever useful to anyone. I bought two sets of macro lenses, each with a +2, 4, and 10 lens. After trying a bunch of combinations, the one that made things most in-focus was 2, 10, 10. I was surprised how much magnification I needed. Unfortunately, those three macro lenses made the image cloudy, and the range of focus is very narrow.
I've decided to scrap the idea of running the fisheye on the vhs, but I'll be using it for b-roll. Fisheye will be used on a hi8 handycam.