Very wise advice.
I own and ride a ST 1100 and a ST 1300. I much prefer the instrument panel on the ST 1100 - it has a light to indicate when the sidestand is down, and it has another light to wake me up when the fuel tank gets low.
I have a GPS on both bikes, and over the years, I have transitioned to looking at the GPS display to find out what my speed is, rather than the speedometer. Partly, this is because I prefer a numeric (rather than dial) display of speed, but mostly, it's because the GPS displays the posted speed limit right beside my actual speed.
Best suggestion I can offer you is to "know when you are well off" - in other words, stick with the ST 1100 instrument panel just the way it is, because it's a heck of a lot better than any digital display on any other bike. Spend your money on a good quality GPS that displays both posted speed limit and your current speed (all Garmin motorcycle units do, I don't know about other brands by likely other brands do as well).
Michael
At the moment I have a mount for my phone and I use it for my GPS [google or Waze depending on my speed