Arm chair guy here, have you thought about designing MEMS-like solenoids directly into a PCB?<p><a href="https://www.researchgate.net/figure/Schematic-Structure-of-the-MEMS-EM-Actuator_fig1_310615934" rel="nofollow">https://www.researchgate.net/figure/Schematic-Structure-of-t...</a>