You need your games to be PAL, as they usually have 3 to 5 languages of which one of them is "Español
".
To make it work, you have to install PriiLoader on your console, and once installed, enable: "Region Free Everything" so you don't have any risk of Brick on your Wii.
After this step of enabling that option, you can use and install PAL/JP games and channels on a NTSC console.
However, some emulators (I don't know which one(s) you are referring to specifically) have a "Force Language" option, and it will give you the option to force either Console Language or a specific one AS LONG AS THE GAME ALREADY HAS THE LANGUAGE IN IT, obviously it would be illogical for an Emulator to translate games, I mean... no.
In that case, just install PriiLoader, enable "Region Free Everything" and your PAL games will be read by your NTSC console.
Although it goes without saying that most games from 2010 onwards already include Spanish in the game options and will be detected as long as your Wii is in Spanish.
For example, Animal Crossing City Folk will detect your console language and will force the text in that language without you doing anything. Obviously this is not the case for ALL games, but it is something to keep in mind.
Just a correction on your first assumption "I need a PAL console for PAL games"... even if you have a PAL console, it will never work in America because of the Voltage differences.
Another observation, older game emulators (GameCube to back) will have no problems starting games from other regions on a NTSC Wii... or at least I have had no problem playing Japanese exclusive Cube games with Nintendont or PAL/JAP N64 games with Not64, or European SNES/NES/GAMEBOY/SEGA/NEOGEO roms. But whether they look good depends on the emulation but not on the cables or your TV device. Just don't move anything to the emulators.
However, if you refer to Wii PAL games on Wii NTSC, PriiLoader solves your problem by enabling "Region Free Everything". This will prevent your out-of-region games and channels from bricking your Wii.
Although to be honest, I don't know if "Region Free Everything" is exclusive for Physical Discs. I mean, I don't know if the "Region Free Everything" option only enables the laser to read discs from other regions, so digital copies will read fine regardless of the option.
Still, install PriiLoader and enable "Region Free Everything" so you won't come asking how to unbrick your Wii after you installed a PAL or JAP channel.
Warning in advance, eh?