I understand your issue. Because the Triumph shifter is NOT splined, it can not be adjusted downward out of the way of your heel, as I have done with my Kaw V2K. I found a splined shifter from a Thunderbird that worked for my R3R and eliminated all the linkage crap.
The distance from the engine spline to the shifter toe location does varry from the R3R to the Standard & Classic so, measuring your bike followed by a comprehensive search will be in order. Good fortune with your mod!