Make it a spell rather than an enchantment

Indeed. There are several one turn duration enchantments that could easily become spells...

Although if we change them all, we might need more counterspell-ish mechanisms, since you wouldn't be able to disenchant them. Perhaps that's why some of these continue to exist as they are.

Many people have been asking for counterspell mechanisms for a while now. Might be a good change to have

They have counterspell mechanisms such as negate.

That's a counter-permanent spell, not a counter spell. Right now the only counter spell out there is Dew Mogi.