Got this working on my iPhone and non-Dell Windows 10 PC and it works decently except for not supporting landscape orientation:
A $7.99 USD/per-PC option (with further options for jailbroken iPhones) is also available int the form of something called “Wormhole” but I don’t have BT that supports the “peripheral” profile it needs. Something with a Realtek RTL8761B chipset: https://er.run/