So I did something similar (well less cool), but as old Software devs start finding our bodies don’t work as well after a while we will see more and more of this sort of “taking control”
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FWIW the latest version of the app does export the previous day's averages to Apple Health (only when you open the app, mind, which can make it look like there's missing data.) I use BPExtract to read the PDF and export every reading to Apple Health but I'll definitely be giving your stuff a go as well (because automation >> manual every time.)
I am not following their business but presume something is up.
Of course the format change seems to have broken the extractor so the next free lunchtime(s) I get will fix it. I assumed no one else uses it so was not in a hurry - any feedback gratefully recvd :-)