Bargain @ 99 cents for today only (Nov 17th) according to the newsletter from Open Road Media (linkage goes to their catalogue page which in turn links to all the standard stores, couponable @ Kobo, should be available in your preferred North American store, price good for Canada & US, may or may not be matched in other regions, etc.):
The Secret Heiress by Lillian Shelley, a Regency historical romance originally out from Doubleday in 1982. Newsletter implies that it's Austen/Heyer-like (but then they might say that for any Regency romance with tricksy complicated courtship themes, so YMMV).
Caroline Chessington is not enchanted by the suitors who flock to Brampton Hall to court her. Caroline’s heart is in search of something out of the ordinary for the time–-love–-and she refuses to settle for less. She has devised a plan to be courted for her personal charms and not her tiara–-and leaves Brampton Hall for London immediately. When Caroline, in disguise, meets Giles Kendal, the son of an Earl, she begins to know love. But the web she weaves to falsify her identity makes a courtship between the two nearly impossible–-until she reveals her identity and allows love and truth to prevail.