those parts "Power Kits" can be use as come and directly level up the parts interested.
Power kits are items for storage management in some ways people control their space or plan on it.
For example, when a player does not have a desire part to max, then use power kit to build up fast level up when get the part and not level up parts not in need.
Also, the player style and how often farm can function or not.
In my case, those does not have function only as direct meat to the weapons based on my play style.
The power kits are storage of power, and you store the power converted of used weapons to level up the kit as you level up a regular weapon. It is not wise to transform them, but it is ok to level up at their current status. If transform them, it is a waste of gold.
What you are showing there, it is ok to do. Remember, do not transform them.