Removing space draw callbacks after losing the handle?

Question

A small edit of test code from GPU Shader Module (gpu) "Mesh with Random Vertex Colors" to save the handle to the driver namespace ...

import bpy
import gpu
import numpy as np
from random import random
from gpu_extras.batch import batch_for_shader

mesh = bpy.context.active_object.data
mesh.calc_loop_triangles()

vertices = np.empty((len(mesh.vertices), 3), 'f')
indices = np.empty((len(mesh.loop_triangles), 3), 'i')

mesh.vertices.foreach_get(
    "co", np.reshape(vertices, len(mesh.vertices) * 3))
mesh.loop_triangles.foreach_get(
    "vertices", np.reshape(indices, len(mesh.loop_triangles) * 3))

vertex_colors = [(random(), random(), random(), 1) for _ in range(len(mesh.vertices))]

shader = gpu.shader.from_builtin('3D_SMOOTH_COLOR')
batch = batch_for_shader(
    shader, 'TRIS',
    {"pos": vertices, "color": vertex_colors},
    indices=indices,
)


def draw():
    batch.draw(shader)


h = bpy.types.SpaceView3D.draw_handler_add(draw, (), 'WINDOW', 'POST_VIEW')

bpy.app.driver_namespace["foo"] = h

Such that we can remove via the python console

>>> dns = bpy.app.driver_namespace
>>> h = dns['foo']
>>> h
<capsule object "RNA_HANDLE" at 0x7f4841cdbf90>

>>> bpy.types.SpaceView3D.draw_handler_remove(h, 'WINDOW')

... otherwise it is drawn on the screen until blender is shut.

Or is it? Is there a way, via python API, to remove all or any draw callbacks without the handle?

Related re making a class to "handle the handles"

I can't get a SpaceView3D draw callback to work

How do you remove a draw handler after it's been added?

handle vertex property changes with msgbus.subscribe_rna