Congrats on the purchase. Saw your post over on the
CTX1300 forum. For a taller shield there are a few options. Other than the Honda tall screen (what I have on mine) Cee Bailey makes one (in multiple sizes) as does GIVI and Madstad and there is even a powered screen in the works if not already out. Rostra CC has been installed on a few CTX1300 bikes and there is another brand (forget just now) who makes a CC system specifically for the CTX1300. There is a member on the CTX1300 forum who makes saddlebag guards and highway peg/fog light brackets. Also, if desired, the top box is available in the USA for this bike both from Honda and also from GIVI (with the mount made for this bike). And again, if you are inclined to replace the stock comfy seat with an aftermarked seat RDL and Corbin have them as well as Spencer and Laam have made them.
BTW- No heat issues. Been to NATSTOC in one day ride (660 miles) and also to OkieSTOC (585 miles). And this is the first bike I've been able to go half that far with no discomfort and on the stock seat. My old Gold Wing was the only bike I could make 300 miles on at one go, but had to get off to rest after that. On the highway traveling in the summer temps I am usually able to ride up to 250+ miles if I ran all the way through the tank. I sometimes fill up at 220-235 miles while going LD. MPG improves after a few thousand miles if from new. (I bought mine with 1 mile on the clock). Maintenance should be no issue if you've worked on your ST since so much is the same.