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Personally, I'd take the pan and a 1/4" NPT bung to my welder and have him TIG that bung onto the outside of the pan.
For the bung, something like
For the bung, something like

1/4" NPT Stainless Steel 304 Female Threaded Stepped Weld Bung with Top Head: Amazon.com: Industrial & Scientific
1/4" NPT Stainless Steel 304 Female Threaded Stepped Weld Bung with Top Head: Amazon.com: Industrial & Scientific
www.amazon.com