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@Mr_Bump
Tiagra 4700/4703 both for drops and flat bar (obvs), match to the pull ratio of the 11 speed 5800/6800/9000 rear derailleurs, just so you have more options to consider. There'a reference to an unofficial nod from someone from Shimano regarding this as well as bike shops having done it
https://forums.roadbikereview.com/components-wrenching/tiagra-4700-shifter-pull-ratio-355678.html
I'm going to put a higher spec rear D with my Tiagra trple STIs when I finally get around to building my ti touring/audx/n+1 so I'd already looked into it last year.
105/5800 rear derailleurs are ten a penny on ebay selling as low as £6 incl post for used/usable ones, probably as vast majority are upgrading to R7000 or higher.
HTH