Philly, I do have drop bars, it seems that with the popularity of gravel bikes brifters for 2X10 should be way easier to get, but what do I know.
I agree with what a lot of folks have said here, my 3X9 setup should be able to work well. I think the cables may be something for me to consider replacing though - I know the last time I screwed around with the RD I replaced the cable housing since it was pretty gummed up.
For now, I've got a new middle chain ring - waiting for a chance to get the tandem out. My stoker seems to be waiting for the weather to warm up. California. Makes you soft.