I just use bearing grease in a syringe, and force it thru. There are a ton of tutorials on this site under the wiki tab, in the Motobecane section. Also, there should be a link to a bunch of Rebel Moby YouTube videos. He’s our local Moby guru, and full of info.
The passages you’re trying to force grease thru are probably plugged with dry, crusty grease. You may need to clean em out. But there should be one for your variator too. You will likely need to remove the variator to clean & service the starter clutches.