An iron stirrer can react with the conc HCl. Wount affect resolution though. For dissolving metal reductions, how about trying Aluminum ?? Its the ultimate electron donor ( 3e- ) Zinc is 2e-, Fe is 1e-.
Aluminum reacts with specific acids at specific concentrations. No one mentions using Aluminum.
Using Al / Hg, is non-ecofriendly and raises eyebrows
There is mention using Zn / Glacial Acetic acid also. I tried Al / NaOH, very exothermic, H2(g) evolved, but it seems its lousy for appreciable metal surface reductions.
The Gallium / Al is only for research / PhD acquiring, not practical day to day use. eg for fuel cell use.
All reductions involve mostly expensive metal catalysts with a myriad of fancy sounding "ligands" but at mild working conditions; cheap metals but at harsh conditions.