With the caveat that there is no truly pure and ethical way to make *any* money under capitalism, here is a thread of historical romances that are swoonworthy without needing piles of colonially acquired/inherited wealth to underpin the fantasy.
Courtney Milan’s After the Wedding: heroine is in service, hero is posing as a valet but really runs a pottery works (the pottery artists are instant favorites): https://www.courtneymilan.com/after-the-wedding/
Beverly Jenkins, especially Forbidden: heroine is a cook who revitalizes a hotel kitchen in a mining town, hero is a white-passing Black man who helps ensure Black residents have access to credit (too complex for a tweet, an awesome, wonderful book): https://beverlyjenkins.net/books/forbidden/
EE Ottoman’s The Craft of Love: quilter heroine falls for trans silversmith in 19th century New York: https://acosmistmachine.com/ 
KJ Charles’ Lilywhite Boys series features jewel thieves, fences, a gentleman-turned illustrator, a music hall singer, and a lady detective: https://kjcharleswriter.com/the-lilywhite-boys/
I am still on tenterhooks for the reissue of Piper Huguely’s novella “The Washerwoman’s War,” not least on account of the gorgeous cover: https://twitter.com/piperhuguley/status/1131209629151768576
Lydia San Andres‘s Cuidad Real and Arroyo Blanco books are full of work (writing, shop-owning, sewing, and suffragettes!) but feel like blissful tropical vacations (lagoons and kissing and guava jam!): https://lydiasanandres.com/books/ 
You’ll notice a lot of these books are by and feature people of color, queer people, and other marginalized identities. Just saying.
I’m listing these books because the question of “how do we grapple with colonially acquired wealth in historicals?” risks assuming that historical romance requires a wealthy duke or an aristocrat. It doesn’t.
Other times you want to watch a courtesan and a constable fall in love despite their wary cynical natures, while solving a mystery in Tang Dynasty China (Jeannie Lin’s books are always my catnip): http://www.jeannielin.com/the-jade-temptress/
There are options where you don’t have to talk about dukes at all! Save yourself from Duke Discourse! Explore the wide, glorious rest of the historical world! There’s so much more history to play with.
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