Technically you’re still an amazing tank class. Peltasta C3 is one of THE best tank classes IMO. It has a high block rate, high defense, stun skills, and aggro skill along with some attack skills if you so desire.
You’d basically be Swordsman C1 > Peltasta C3 > Squire C2. If you however want to have some DPS along with squire however, you’d have to change that.
Swordsman C1 > Peltasta C1 > Hoplite C2 > Squire C2 seems like a pretty good combo for DPS for me as well sacrificing your defense for a lot of damage potential as well as CC with Arrest if you wanted to go that route.
edit: also does squire buffs, the repairs as well as food last outside of the campsite or is it just around the campsite? If it persists outside of the campsite range, it is possible to have that for PVP and GVG as well since you can increase weapon damage, armor ratings, and give food buffs to your pvp teammates and guild members.