Doc Holloman,
I did this same 'hunt and search' thing two years ago. The answers I received were what you are looking at now.
Back then, the only rifles 'available' in 38/40 were the 1866. So, to satisfy my desire for an 1892 design -- it was find a Rossi '92 Octagon Rifle 'specifically in 44/40' and have it lined to 38/40 or buy an original Winchester. In the end, I got luck and found an original in March of 2022, that I could afford.
But then in June of 2022, a shipment of 1873's in 38/40's came into the US. Dixie offers these 1873's.
Good luck in your search.