Hello and welcome,
Yes.
I’ve meant it’s not advisable for people without some mechanical skills to do the upgrade themselves.
(And it’s still not that cheap…)
For an experienced bike mechanic should neither the ordering nor the installing of a Schlumpf drive into a Strida be a problem, I believe.
Sadly is the upgrade of an LT to a 3-speed drive (the new EVO) technically impossible, however, with the EVO you can get more gear per money.
Every (further) question about the Schlumpf drive is welcome… 