We then highlight the modularity of our polymer bridge by including groups that enable nitro-catechol chelation and metal-thiolate chemistry to drive the co-binding of TiO 2 P-25 aggregates and single Au nanoparticles onto SiO 2 microparticles via simple bulk stirring. Finally, we demonstrate an application of our modular approach to nanoparticle attachment by extending our previously described Toposelective Nanoparticle Attachment (TNA ), to incorporate magnetic functionality into our microswimmers and thus obtain decoupled mechanisms of propulsion and steering. The intricate, 3-D motion of the resultant multi-functional microswimmers is characterised using a Machine Learning algorithm that we previously trained on experimental data.