Demonslayer should do SR 75, although you miss few important things, outside of Wendigo you have no leech, you can add 2 out of 3, either Scales and drop Revenant, Bat, which is mandatory, I would say and Ghoul. Also DA needs to be improved, some of the gear, like this medal is subpar.
Also you have 4 points over the cap on PB, three more attribute points, you get incorrect build message in GT. You probably gave yourself 3 extra points in attribute over skill points in GD stash. Also Blade Spirits are good in your build, work on getting them at 24/16 for extra summon, Reaper pants can help you with that. And slight boost to DA will help you too.
Templar I have build like this and is fairly squishy in SR. But with kiting SR 65 is possible. So kiting , combined with Blazeseer ring for conversion and different Bat procer should help you.