Yes, you can just increase the DC by 5 to ignore the caster level requirement.
From the Magic Item Creation Rules:
Note that all items have prerequisites in their descriptions. These prerequisites must be met for the item to be created. Most of the time, they take the form of spells that must be known by the item’s creator (although access through another magic item or spellcaster is allowed). The DC to create a magic item increases by 5 for each prerequisite the caster does not meet. The only exception to this is the requisite item creation feat, which is mandatory. In addition, you cannot create potions, spell-trigger, or spell-completion magic items without meeting its prerequisites.
Therefore, if an item has a caster level as a prerequisite for crafting it, you can ignore it for a +5 to the DC of crafting that item.
Note that while the base DC to craft a magic item is 5 + that items caster level, there is not usually a caster level prerequisite for a magic item (and even if there is one as a prerequisite, it may not match the item's caster level).
This means that for a level 5 wizard with Craft Wondrous Item and Haste, despite Boots of Speed having a caster level of 10, the DC for crafting them is only 15 (base 5 + caster level of 10). It is not increased to 20 because there is not caster level prerequisite for crafting it.