I'm happy that the trip worked out.
Buying a second hand bike more suitable to the road conditions and optionally selling it later seems sensible.
If you're sticking with the R3R here are some other things to consider for touring:
1. Do you really need the extra power?
I did my intake/exhaust mods just before taking a 25 day 9,800 mile trip.
Pipes, filters, Power Commander and custom tune were around US$2,300.
The drop in MPG cost me over US$150 in gas. I love the increased performance but it could have waited.
2. Your 2012 is 8 years old so unless you've been doing all the maintenance it may be time to go through the checklist and do all the checks and all renewal items (plugs, radiator flush, brake fluid renewal, diff etc.).
3. I love my throttle rockers (wrist rests to take some strain off forearms). I don't ride without them.
4. I like my Throttlemeister manual throttle lock on my old bike but the Go-Cruise 2 poor-man's-cruise-control works fine and was cheaper.
5. Kuryakyn or other ergonomic grips are a must.
6. Look at seat upgrade and/or cushion. I use an AirHawk air mattress on long trips - Available for pillion too.
7. Improve the horn. I use Denali Soundbombs on mine but there are other options to replace/augment the sissy one.
8. Improve rear visibility. I almost got squished by a truck last October so will be working on mine. LEDs...
9. Suspension is key as per recommendations on your other thread.
10. Windshield - it looks like you have the small one like mine. I'm getting too old to take the beatings!!
11. Did your Roadster come with the luggage rack?
If not you can get one if you want to do a similar mod to avoid buying or making brackets for a top box.
On my R3R I removed the OEM backrest and bolted a Givi e251 mounting plate to the rack and use a Givi E460 Top Case with a back rest and small rack. It locks into the mounting plate and can be taken off easily.