With a cursory search, I found a couple items. The reference I found indicated Heal Kits can come in +1 to +10, not just +2. I also found: Magic Item Compendium - Healing Belt – Gain a +2 competence to Heal Checks and has 3 healing charges. There are also Psionic Shards that can be up to +10 to a skill ability that can be applied to Heal.
I noted that these also have instructions on what it takes to craft the items. The belt for example requires Craft Wonderous Item, Cure Moderate Wounds, 500GP, 40XP and 1 day to craft. How much would the benefits and cost scale up if Cure Critical Wounds was used instead?
Using templates from existing items or the rules for crafting you could generate any number of items that can benefit your player character. You could also apply an item that grants a feat, or craft one and apply the feat Skill Master and specify Heal, this would provide a +10 to Heal Check.
Skill Mastery is also a feat the play could gain that grants a +10 to the skill. If you are writing the Prestige class you could incorporate Skill Mastery Heal as a special gained at a given level. You could possibly create an Improved Skill Mastery Heal that stacks for a second +10 if you want the PRC to have healing that powerful.
Hope you find this helpful.
If I were to crate a masterwork blue ice long sword, would it be the same as +1 blue ice long sword? (Minus it being magical) +1 to touch and +1 to damage?
For the purposes of attack and damage rolls, yes. For most other purposes, no.
The issue is that while attack rolls with the weapon have a +1 enhancement bonus, and damage rolls with the weapon have a +1 enhancement bonus, this is not the same as the weapon itself having a +1 enhancement bonus. Enhancement bonuses to weapons add enhancement bonuses of the same value to attack and damage rolls, but they do more than that. They increase the weapon’s hardness, they allow the use of weapon augment crystals, and so on.
The weapon is also not magical. It’s not subject to dispel magic, but it doesn’t overcome DR as a magic weapon would, either. It has no chance to glow (as 30% of magic weapons do). Anything that talks about magic weapons isn’t talking about a masterwork blue ice weapon.
Does this enhancement stack if the weapon were to be magical, say a +2 blue ice long sword. Giving a +2 to attack and +3 to damage?
No. Both the enhancement bonus to a magic weapon and the blue ice apply an enhancement bonus to damage rolls; enhancement bonuses never stack.
Magic weapons have enhancement bonuses ranging from +1 to +5. They apply these bonuses to both attack and damage rolls when used in combat.
(emphasis mine; the bonus is not just the number, but the type too.)
Enhancement bonus
An enhancement bonus represents an increase in the sturdiness and/or effectiveness of armor or natural armor, or the effectiveness of a weapon, or a general bonus to an ability score. Multiple enhancement bonuses on the same object (in the case of armor and weapons), creature (in the case of natural armor), or ability score do not stack. Only the highest enhancement bonus applies. Since enhancement bonuses to armor or natural armor effectively increase the armor or natural armor's bonus to AC, they don't apply against touch attacks.
Best Answer
These bonuses stack:
Specifically, a circumstance bonus/penalty:
and a competence bonus/penalty:
So, a circumstance bonus and a competence bonus would stack with each other: they'd both modify the roll if they both applied. The bard would get a +7 with their magical, masterwork flute.
Note that bonuses "provided by multiple masterwork items used toward the same skill check do not stack". So, the bard somehow using a masterwork flute and a masterwork lute on the same check would only get the higher circumstance bonus.