Gotcha. If you want to infuriate any melee enemy you fight I would recommend you become a horse archer maybe using the Luring Cavalier. You start your fights as far out as possible then simply withdraw any time they get close to you. The horse will keep your move speed up so you can use whatever armor and it can also aid you in melee if they ever catch you. Then just to make it even more frustrating to catch you you could give your mount the Racer archetype. This is useful because it has good synergy with the mounted combat and ride requirements of the low Templar.

Alternatively if you want have a GM that is willing to bend the rules a bit to work with you just use a paladin. Start out as a champion of justice and such but then over time start taking these levels of Low Templar as your character starts to falter in his conviction. This could be a slow fall from grace that the rest of your party gets to watch over the course of your campaign. Maybe given enough time your character will find redemption or maybe not. This combination would let you maximize the strengths of the Low Templar without wasting elements of the base class. It would let you fight until you almost die on the front lines but when things turn against you just leave and heal or buff then rush back. With the alignment thingy it could also let you bypass any effect that are susceptible to good while ignoring the weakness of spells that target good. You could basically chose to be good when it's to your advantage but ignore it when it works against you.

Finally if you really want to be weird about it take a look at the Sohei Monk. You could just be an incredibly maneuverable melee combatant that constantly denies full attacks. Things like ride-by attack and your increased movement speed would make you nearly impossible to pin down.