With respect to the photo above showing a gel insert to my dirt bike which worked quite well, I have come to realize that the application of seat mods between dirt bikes and touring bike require quite different materials. On a dirt bike your constantly standing and use of the seat limited so heat build up and soft seat problems are not an issue but a benefit in constant kidney pounding terrain.
Too soft a touring bike seat will provide poor support for your back muscles that struggle to support you on a soft foundation. Because of the constant sitting heat build up in the seat can be made worse by a gel insert with no foam barrier between the hot vinyl seat cover that also complicates heat build up because vinyl doesn't breath. The stock B1250 seat is a well made seat with firm but comfortable foam for long rides, the problem is the vinyl seat cover which needs to be replaced by a air breathable water resistant cloth cover similar to what they use on modern cloth top convertible top automobiles. A breathable cover would make a big difference in long distance comfort, especially in the extremes of winter and summer. If I do reupholster my B1250 seat, it will be with a breathable black cloth cover, not with vinyl.