One simple way to increase swordplay.
A level 80+ trait or CD skill that reducing the mana cost of enchanted sword attacks, allowing you to get more hits in your burst window.
Perhaps completing one whole combo replenishes a certain % of your mana gauges and adds a stack that contributes to your Holy/Flare/Scorch cast.

E.g. completing a combo (123) doubles your remaining mana and reduces the mana cost of enchanted skills to 20/15/15 respectively, while granting you an 'Arcane Enchantment' stack.
This would give you just enough mana to get two combos out if you started it with 95+ of each mana.
The 'Arcane Enchantment' stack is what allows you to cast Scorch after Holy/Flare, so getting two full combos out enables you to cast two Scorches.
Then at level 90 you get a new sword skill, that consumes an 'Arcane Enchantment' stack, so you have a choice between Scorch or this new skill, depending on range.