"stand" is natural to me. I wouldn't say it was tremendously common though (in this sense). "Most welcome" is not right.
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Mr. Tom[children to their father]If we came with you, would you stand us a Subway burger on the way?This seems wrong; children do not usually pay for their own lunches or need to request someone else to do so.
Mr. Tomman to his friend on a lighter note]A- John, why don't you stand me lunch today?This is the right environme