Lindexed same as Linklicious will help in the crawling process, while something like this #1 Rated Backlink Indexing Service | Index Backlinks | Backlinks Indexing to Boost Your Rankings will help you to index them faster, or you can simply build backlinks on your backlinks.

Yeah building backlinks to backlinks is the easiest way to go IMO, I used lindexed for awhile, wouldn't recommend

I don't use it.

It looks unnatural.

Why you would want to give your site huge link spikes is beyond me.