Improvements To The Speed Twin 1200

I've changed out my rear shocks to K-Tech units and it seems a bit less 'clunky', don't think it would make much difference to the comfort level though as they are set with handling as the priority.
I was looking at the Triumph comfort seat but opinions seem to be that it is not that different to the stock, best suggestion seems to be to get it re-upholstered by a specialist.
Small windscreens are available from various suppliers, but again this seems to be a trial and error process, some claim they help, there is a woman in the UK called BikerKaz that puts up lots of videos on YouTube. She fitted a small bikini type fairing and says it makes a difference and she does lots of long tours on her Speed Twin.

 

I would ad heat-grips on your list.

 

From your description I wonder if an "adventure" style road bike might be a better solution - you'd have the advantage of a comfortable riding position, a screen, a monoshock rear suspension system (which I suspect would be a lot more compliant than a twin shock setup), preferably with road tyres on 17" wheels, and be on a bike designed for fast, long distance riding. The centre of gravity might not be lower (you'd have to be looking at a cruiser style bike for that) but these "adventure" bikes are usually very well balanced despite being taller.

What could that be? Well, maybe a Triumph Tiger Sport 660 or 850, or a Tiger 900GT for it's road-biased spec. Other makes are available......

Of course, they don't have the retro appeal of a Speed Twin!

 

I bought my Speed Twin 1200 last August, ex-demo 700 miles. It now has 6,000 miles on the clock. I too considered suspension changes as the ride was harsh on the awful British roads. However, I first put the rear shocks on the softest setting ( need to remove the exhaust mufflers to turn the adjuster, simple enough). But the break through was ditching the awful Metzeler Roadtec RR tyres and fitting Michelin Road 6s. It transformed the bike. I've covered the best part of 4,000 miles on the Road 6s and am no longer considering changing the rear shocks.
For navigation I use a Beeline Moto, it takes a bit of learning but once mastered it's fantastic and easily fits to the handle bars, no wiring and is removed in a second so won't get stolen. Enjoy the torque

 

The Road 6s are excellent all round tyres, probably not ideal on a track, but loads of grip and great in the wet. I also have them on my BMW GS and they stick like glue and have great mileage too.
Read some reviews of Road 6s against other tyres, but I guess it depends on what you want to do with the bike. I also found the Metzeler Racetec RRs were awful on wet roads, which we have a lot of in Britain. Whereas, I've never had any concerns with the Michelin's.
I'm just at the end of a ten day tour of Ireland, the Michelin Road 6s have handled everything, wet, dry, smooth, rough, gravel, etc without any problems.

 

Road 6 tyres are a top choice - my cousins have them on their BMW S1000R and Triumph 675RS, and they are a popular choice for friends with road use adventure bikes.

Never used them myself, my local shop always had a great deal on Pirelli Angels which suited me fine on previous bikes. Metzeler Sportec's on Speed 400 seem good, and we'll see what the Triumph dealer is offering when they need changed.

 

Aprilia Tuono V4 is a race/track bike with sit up handlebars a bit of an animal and ticks less of your boxes than the triumph .a bloody good laugh tho and would be a steep learning curve for a new/inexperienced rider

 

Aprilia Tuono V4 is a race/track bike with sit up handlebars a bit of an animal and ticks less of your boxes than the triumph .a bloody good laugh tho and would be a steep learning curve for a new/inexperienced rider