OK,I will start this.
Nice bike and your high level plan is very possible.
First things first.
No sense in getting carried away with bench racing the "stage II" right now just understand that is very possible and the components I suggest will go there later.
I would suggest finding a very talented tuner and purchase the software for a custom tune (my preferance TTS but the tuner will dictate what they use), in your area hopefully, get a HD Heavy Breather, Zippers or Wood AF and change the pipe to Cycle Shack slip-ons or if you like the 2 into 1 look there are several good ones that will transfer over and work well with stage II plan.
Some examples, V&H HO Propipe, D&D FatCat, Rinehart 2 into 1, Bassani Road Rage, and not the V&H Big Radius sorry to say.
Most of these components are a bit overkill for the stock motor but will have very little downside and grow up well later
Understand that depending on the dealer warranty, engine only, could be at jeopardy and in these days of high shop rates and given all the issues \ history with the 110 this is something to consider I would want to have a contract in writing if the dealer will allow these mods. The better of them are not fussy, and the others will hang you out to dry or blame things that are not related to the mods in the event of a failure.