You can try, but honestly the odds are against you. I re-rolled for two days straight and could only manage single SSR pulls, aside from the occasional double SSR weapon ones (no characters, just the weapons). Honestly, I'd aim for a single SSR character that you REALLY want. If that just happens to come along with another SSR, character or otherwise, that's a bonus.
Personally, I aimed for Sol, since she remains among the "God-Tier" in the Japanese version, since she's a healer/support character. Her nature (light) means I can put her on any team and she'll hit for neutral damage (against anything other than dark, in which case she'll do 2x). Amon is a great character though, and the Echidna summon looks helpful. If you like Amon (and you should), I'd just go ahead with that. If you value/want another SSR character instead, you can try for her.