Pilar Guy

It seems that you do not want to move to the US, you do want to give your wife the opportunity to do so if you die?
 
I am guessing a bit but it would be really helpful if you  could explain what you would like to achieve?

In addition to the above, if you were to apply for a spousal visa, you as the USC living abroad would also have to show "intent to re-establish domicile in the US" - you need to convince them and you intend to abandon your residency abroad (to a degree that you have no further intention of living in the Philippines for a reasonable time) and move back to the US. 

Everything that you want for your wife can be accomplished. But you have to realize that there are strict conditions that need to be met before your wife becomes a citizen. It is not like you can send in the paperwork and your wife becomes a citizen in a few months. It will take years before your wife becomes a citizen. 
 
The steps are as follows:
 
1. You file for a spousal visa for your wife. (About 9 - 12 months process)
2. You wife interviews for the visa.
3. Wife comes to the US and obtains a green card (permanent residency).
4. Wife stays in the US to maintain her permanent residency.
5. In 3 years, she can apply for naturalization. (Process can take 6 - 10 months).
6. Wife takes exam and has interview.
7. Wife swears in to become a citizen.

If the two of you are not looking to move (immigrate) to the US yet, then the only option is for her to get a tourist visa. Unfortunately, it can be difficult for many Filipinas to obtain visitor visas. So it is not a guarantee. Only thing she can do is apply and see.

Yes it's possible. Use the DCF method outlined here 
 
 

Nope.  Realistically the only options for her are immigration visas.  There is a tourist visa but very difficult to get for SE Asia.  Marriage based visa typically take 14-18 months to get.  I'm halfway through myself.