I haven’t used this setup, but have used a similar commercially-made lens (Mikaton 4-4.5x) fairly extensively for field botany photography. Even with an adjustable aperture on the Mikaton DOF is thin, but it’s usable even for handheld field macro pictures.
1st and 2nd images are with Mikaton at 4x: https://www.inaturalist.org/observations/106890266