I've always pulled it before dealer visits, but I did use a splitter for my bypass so I just have a 2nd port behind the dash. I installed a high quality splitter on the stock OBD2 plug with one end going to the stock location and one end going into this guy.
https://www.kaodtech.com/product-page/security-module-bypass. My truck only sees the dealer for recall work as I do my own service for everything else. Isn't really an issue out here with rural dealers and warranty, even having all sorts of aftermarket parts like the banks intake elbow/grid heater delete. 9 time out of 10 they ask me if I'm tuned to avoid to re-flashing the truck so one of those situations where I don't worry about the dealer.
Also Alfa really isn't too hard if you're familiar with professional grade scan tools or WiTech. There are plenty of threads such as :
Here's a roll-up thread for posting links to any successful DIY Sales code mod and AlfaOBD settings required (or not) and common AlfaOBD settings only mods. This is NOT a How-To or Q&A for AlfaOBD or discussion thread. Links and settings only please. TL;DR If you're not here to contribute, you...
hdrams.com
and the bulk thread :
Has anyone played with AlfaOBD on their 2019 HD's yet? I'm curious if anything is accessible to "change" and if it just works. There is lots of different info out there on other forums, but i haven't found anything in regards to the 2019's. EDIT: AlfaOBD does work, here is the what is needed...
hdrams.com
So long as you take a backup of the truck really the worst case is that you restore it.