Yes, but probably won't help out here.

The BMX crowd use hi-rise bars, not stems, to get the grips up high, and the reach of BMX stems is typically very short.

Also, BMX stems often have 7/8" bar clamping instead of the common MTB/townie 1" clamping, and are usually very heavy-duty and un-svelte in appearance.

An inexpensive .833-quill adapter, onto which clamps any threadless stem, is one practical solution, though not much of the "vintage road" style.
The threadless clamp-on stems with 1" clamping will typically also clamp onto 26mm or 25.8mm handlebars very acceptably and also allow very quick stem swaps.