It would probably be a better option to buy a good digital piano instead, for the same 2000$, you would have a much more supple option there.
Silent systems are better when build at the factory, if you add it afterwards, the results will depend on the technician installing it, and you may also need his help repeatedly after the installation for fine tuning the sensors.
Unless it's really a budget issue and you go with Kawai K15 ATX 2 or newer Yamaha B1 Silent (now that they added a MIDI out to it at last!..), indeed an optical system would interfere as little as possible with the touch.
What mechanical sensors need to operate properly is a let off point set higher, which means you will have to send more force to the keys to produce a sound, and hence an acoustic touch where you have to struggle with the let off to play ppp notes. In short it means these pianos with mechanical Silent systems tend to offer acoustically only pp to fff dynamics. On the other hand, it can be a good thing to learn and play between ppp and pp with great nuances, but it's not very comfortable and since you need a silent system in the first place because of the big noise of the piano in the first place in your environment, it means you will probably play between ppp and mf all the time, so that this gap between silence (let off) and pp(p) will be right in the middle of the playing zone you would like to play the instruments acoustically...
Mechanical sensors compared to 2 sensors optical systems are better for repetition as you can repeat notes from the same let off point it's set for acoustic operations, but 3 sensors optical sensors surpass them both. None of the three offer quite to play more than ff in the silent mode, so that's another limitation.
But the feel of the acoustic piano is intact and compensate totally the issues I mention.
A digital piano at the same price point in comparison would offer to play from ppp to fff, wooden keys, quite a realistic grand piano touch (that's very different from an upright piano though, much easier to play and master, it can trump your touch on your upright and be a problem too), quite a realistic piano sound (through headphones,otherwise it's almost impossible to amplify and render the sound properly or even convincingly via speakers, without mentioning the fact that you would suffer the artificial noise more or less of the digital keyboard itself.)
On a silent piano, even an older mechanical system, you can still feel the keys vibrating under your fingers, and it's a great feature to be able to play your piano at night indeed.
Maybe if you can, not necessarily at the same time, you will experiment both. A silent system adds a resale value to the piano and prolongs a high resell price, digital pianos loose 1/3 of their value from day 1 and as technical progress goes, it goes on loosing value. Digital pianos keyboards and DAC wear also more or less quickly, much quicker than the acoustic keyboard of a silent piano.
I have both, I can imagine selling the digital piano, not the acoustic, even if it's not a great piano (acoustically nor silently), it's still to this one acoustic silent I refer when I think of my piano practice, and even if the digital is by far and in every way superior technically, it's the one I wouldn't matter getting rid of, not the other way around. Maybe that can tell you something about the "silent piano" phenomenon and interest.