For adjusting handlebar height, you have a few options, though they won't be quite as simple as a quill adjustment.

1. Flip the stem. With a -17° stem like mine, I can raise the handlebars significantly by just flipping it over. It won't look as slick but for a long slow ride or to let a friend use for a weekend, it would do the trick.
2. Don't cut the quill all the way. If you are ok with some protruding quill above the stem when the handlebars are fully lowered, you can use the extra height to raise the bars when desired. Combined with a stem flip you could really raise the bars quite a bit, likely far more than a traditional quill would allow. Just make sure your cables are long enough for it.
3. Use an adjustable stem. Last on a list for a reason but you could swap one in for a fixed stem as desired with little fuss if you didn't want to run one all the time.

In all cases, you don't need to worry about headset adjustments like you would with true threadless which makes it less painless, just not as pain-free as a normal quill.