This is a small blender script to convert simulated hair particles into a series of curves that have a bevel applied to them. This script was used for this project: https://youtu.be/rIxeJ6HQrrE

AnimatedHairToCurve.py

import bpy

depsgraph = bpy.context.evaluated_depsgraph_get()
object = bpy.data.objects['Source'] # Object that has the hair simulation
taper = bpy.data.objects['Taper'] # Curve each generated curve object should use as a taper
particles_coll = bpy.data.collections.new(name="particles")
bpy.context.scene.collection.children.link(particles_coll)
start_frame = bpy.context.scene.frame_start
end_frame = bpy.context.scene.frame_end
for frame in range(start_frame, end_frame + 1):
    bpy.context.scene.frame_set(frame)
    depsgraph.update()
    bpy.context.view_layer.objects.active = object
    object.select_set(True)
    bpy.ops.object.modifier_convert(modifier="ParticleSettings")
    for obj in bpy.context.scene.objects:
        if obj.type == 'MESH' and obj.name.lower() == 'mesh':
            obj.name = str(frame)
            particles_coll.objects.link(obj)
            obj.hide_viewport = True
            obj.hide_render = True
            obj.keyframe_insert("hide_viewport", frame = frame-1)
            obj.keyframe_insert("hide_render", frame = frame-1)
            obj.keyframe_insert("hide_viewport", frame = frame+1)
            obj.keyframe_insert("hide_render", frame = frame+1)
            obj.hide_viewport = False
            obj.hide_render = False
            obj.keyframe_insert("hide_viewport", frame = frame)
            obj.keyframe_insert("hide_render", frame = frame)
            bpy.ops.object.select_all(action='DESELECT')
            bpy.context.view_layer.objects.active = obj
            obj.select_set(True)
            bpy.ops.object.convert(target='CURVE')
    
    for obj in bpy.context.scene.objects:
        if obj.name.lower() == str(frame):
            obj.data.bevel_depth = .3 # Bevel amount, change to set the base thickness of the curves
            obj.data.taper_object = taper
    
    bpy.ops.object.select_all(action='DESELECT')
    print("frame {} processed".format(frame))