Hmm. "In the vein of Golden Age" ... thinking of Christie's Miss Marple mysteries, possibly Susan Wittig Albert's China Bayles series, Laura Child's tea shop mysteries, and Donna Andrews's Meg Lanslow? Also, would M.C. Beaton fit that particular mould? Or possibly that of Dorothy Sayers and Margery Allingham?
For a series involving a male main character, I was initially tempted to say Colin Dexter, but Morse, for all his erudition and iconoclasm, is perhaps just a tad too grumpy to fit in with the Poirots and Holmses. Then again, Ngaio Marsh's Inspector Alleyn would probably have gotten along well with Ruth Rendell's Inspector Wexford, P.D. James's Commander Dalgliesh, and Caroline Graham's Inspector Barnaby ...
All of which series I'm sure are not new to you, however, so no help on that front, sorry -- just the ones that come to mind most proximately if I think "Golden Age gone contemporary"!
That all said, have you seen
"Murder by Death"'s review of Sofie Ryan's "The Whole Cat and Caboodle" ("Second Chance Mysteries, #1)? What she wrote made the book go straight onto my TBR list ... and it would seem to fit in well with the the Miss Marple-alikes in the new cozy crowd. (Am I the only one who finds it strange that virtually all of these feature a MC who is some sort of shop owner or inn keeper, btw?)