I would be really surprised to see that taking the control panel/box off as being the better alternative to what's shown on the video or fitting grip tape like that used on tennis racquets etc. and all that just to replace the handle rubber grip.
The rubber tube handle could be warmed up(hair dryer,oven, hot water) and pre rolled onto a plastic/metal ring or rolled onto the shortest possible length of a pvc plastic/metal tube that was a slightly bigger diameter than that of the battery pod/shaft handle(after removing the 5 screws though I did it with 3 and the stand). This would allow one to deliver the rubber over the area and unroll it there without the need of "soap-on-fication"(word used where I used to work for soaping and wetting a product for assembly)of the rubber sleeve and then having to push it all the way along the length of the battery pod/shaft shaft.
Now, unless the Etrac has been assembled vastly different to the Explorer's, Quattros and Safaris, in that the control box is far easier to remove and just by looking at it from the outside, it seems no different to the Explorer's etc assembly. Having peeked on the inside of the Etrac when I first got one a few years ago, I noticed that when it came to that part of the assembly, is not that different either. The electronics are BUT the rest is similar(smaller control box than Explorers etc).
In my little experience with the removal the Explorer control boxes off the handle neck,it was required in some cases, to actually break and cut bits of plastic off and this was only due to some gluing that was used to maybe repair or maybe stiffen the assembly. The tube handle had to be relocated further back down along the rear of the handle/bat. pod. or removed in order to
Yes, you can always take the control box off and replace the grip......BUT, in my opinion, unless the grip is somehow kept expanded or relocated further back, it will keep the assembly "clammed" together at that end and that would present you with another set of problems that include the ones you might encounter when you de-solder some wires(unless they are plugged in and can simply be unplugged) and then deal with the coil connector that was usually needing to be pulled through the assembly that requires the shaft cam clamper to be dismantled and a section of plastic within that area to be expanded.
It isn't that difficult but why bother?
David Di