The half-pitch perfboard is neither cheap nor readily available (it’s still on its way from China). I wasn’t about to wait. 
(You’re rather lucky with the 5003 - it’s not hard to get a connector for that, versus the 7003 - nobody sells a breakout board or converter for that.)
I’m glad you like the code! It’s still very much a work in progress… still need to update the backend code to be more useful, and interpret the PM data more usefully as well.
In other news, Plantower has released an even smaller sensor, the A003… haven’t seen it for sale yet but it uses that same tiny connector as the 7003