If you pull the tire completely off and reinstall it with a new or patched tube you can use the zip-tie method to prevent puncturing the tube with spoons.
A
somewhat portable setup of a different type of tool you could use is the the
Kauritmoto Original Tire Mounting Tool with SuperAxle upgrade, or
Baja No Pinch with one of the smaller axle shaft adapters, probably the 12mm one since the stock axle is 12mm.
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I have the Kauritmoto TMT, bought it to use for changing tires while traveling on a different motorcycle but also optioned it with the "SuperAxle kit" for use on my mini motos. It is much easier to use than spoons alone but it's also heavy. 2 lb 6 oz for the setup equipped for use on the CT wheels.
The Baja No Pinch is apparently a copy of the same tool, but lighter weight and possibly lighter duty. One of my friends carries his Baja No Pinch adventure touring and even used it to change a tube in Baja on his Yamaha WR250. He loves it. You'll find many positive reviews especially from dirt riders, and from folks with sidecars and motorcycle trailers that run tires with stiffer sidewalls that are hard to mount by hand with spoons alone.
Someone on one of the CT125 facebook groups posted about bending their Baja No Pinch trying to mount Shinko SR244 tires on the CT125. Personally I suspect they may have not been working the tire correctly and didn't have the opposite side of the bead in the drop-center of the rim.
Photo from facebook:
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