We've got kind of a mishmash of solutions that depend on the application. Most of our customers have a local salesman who calls on them, and most of our salesman who have PLUS+1 customers have the Service Tool on their laptop. That along with Teams for screenshare can get us through some goodly amount of testing.
Our customers who require the most heavy duty support also tend to have at least one technician or engineer who is technical and patient enough to be walked through getting the free version of GUIDE with which also include the full version of the Service Tool. However, this has become much more difficult since the only way to get that stuff is through the Update Center, but it's just like an annual hassle. Generally, if one of our customers has a machine that needs programming support then they're sending one of those guys out to the machine because there's often hydraulic/machine support needed too. The slow improvement of the CS product line is beginning to help mitigate some field visits.
One major critical step that I learn some years back is that you can create log and parameter pages without having a controller connected in case you haven't tried that. You can load the .lhx as a diagnostic file into the Service Tool in Offline Mode and set the ECU to that file basically. Then you can add and tweak parameter and log pages to your .p1d file which you can then send out to a customer/technician.
