If you choose "spirit" do all the face up monsters also get returned to hand? If yes, I think there could be a combo with a card that makes your monsters stay on the field.
Has anyone tried or knows if this works
Even ignoring the fact "Sub-Type" is a fan-term and not an official one, they're not types. And the fact they're not types is relevant here, because DNA Surgery can only change Types.
It's about as close to a Type as an archetype is. >.>
fusion,synchro,xyz,and potentially link is a "kind". and that is an official term used on sacred serpent's wake. later on they are referred as "type" on the effects of cards like invincibility barrier and inspector boarder. there are "subtypes" that are written the monster type. how are people confusing secondary types with monster types is beyond me btw
btw primary typings are officially called "monster type" while the other types listed after that; effect,flip,tuner,spirit,link,toon etc dont have an official term unless you count sacred serpent's wake referring to fusion synchro and xyz as "kind"
The stuff like Flip and Tuner is listed as "card type" in the official database. (Though that is also the case for the "primary typings" like Fusion and Synchro.)
You're likely never going to find a card referring to the things fan-termed "sub-types" since it doesn't make sense for something to randomly support, say, Spirits, Toons and Unions all at once.