Mechanic: Custom Rig
Starting equipment: a 1 Bulk multi-tool that counts as both a commercial repair toolkit and your choice of commercial hacking, infiltrator's, or maker's toolkit; usable one-handed...
Your signature multi-tool integrates a repair toolkit with one additional toolkit of your choice.
You begin with a specialized toolkit called a custom rig that weighs 1 Bulk and counts as both a commercial repair toolkit plus any one of the following toolkits of your choice: a commercial hacking toolkit, a commercial infiltrator's toolkit, or a commercial maker's toolkit. You can use your custom rig with one hand if you're wearing it or two hands if you're holding it.
Whenever you purchase one of the listed toolkits, or a higher-grade version of one, you can spend 10 minutes integrating it into your custom rig. If you do, your custom rig gains the properties of that toolkit without increasing its Bulk. Your custom rig and any integrated toolkits can't be sold or used by another creature.