A way that I've been doing this recently (though this is more for transferring saves between regions) was by using SaveMii.
I made a backup of the vWii save using SaveMii (you'll have to save in that game first before it appears I'd imagine), which saved a backup to my SD card in...
I don't think I can post a link to anything as I'm still new here, but I was able to make a forwarder myself using Boot2vWii that works on Aroma - I'd recommend having a look into it, it seems pretty neat! I'll post a link to the .wuhb I made myself in a bit when I'm able to too.
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Hi! I'm River (they/them), I'm big gay and liek nintendos. I've been using a bunch of the stuff (homebrew, CFW) people have made for Wii U and 3DS, and hope to contribute myself in a small way lol. Anyway, nice to meet you all! ^^