Put ancho chiles in a heatproof bowl, cover with boiling soaking water and stand for 15 minutes. Blend the softened chiles with 1 1/2 cups soaking liquid until completely smooth; discard the remaining soaking liquid.
Heat oil using the sauté setting of a 6-quart electric pressure cooker. Brown pork in two batches for 3 minutes per side, then lift out; soften onion for 5 minutes and add garlic and cumin for 1 minute.
Pour in broth and scrape the bottom completely clean. Return pork, add chile puree, oregano and salt and stir well; keep contents below the cooker maximum fill line.
Lock the lid, set the valve to sealing and cook at high pressure for 35 minutes after pressure is reached. Allow pressure to release naturally for 15 minutes, then release remaining pressure according to the appliance directions.
Check that pork is fork-tender; if needed, simmer on sauté until tender. Add chickpeas, whisk masa with its cool water and stir it in, then simmer gently for 8 to 10 minutes until thickened; add lime juice.
Divide among six shallow freezer containers. Refrigerate within 2 hours, chill completely, leave expansion room and freeze for up to 3 months.
Reheat one frozen portion in a covered saucepan over low heat with its measured reheating water, breaking it apart as it softens. Simmer and stir until every pork piece reaches 165°F, usually 20 to 30 minutes total.