Replace the Stocky workflow, not your Shopify catalog
Replace Stocky with StockFlow: barcode stocktakes, reorder suggestions, purchase orders, and receiving that writes Shopify inventory only after confirmation.
Count → reorder → purchase → receive
StockFlow is a replacement for the operational loop many shops used in Stocky: count what is on the shelf, see what to reorder, send a PO, and receive it back into Shopify.
It does not try to be an ERP, WMS, or accounting suite. Shopify keeps products, locations, and live quantities.