I'm evaluating identi.ca, and it looks very attractive. One extra nice feature would be the ability to subscribe to a Twitter feed (what's the correct terminology), especially because Twitter is practically the only player in the industry.
Twitter – way to receive Twitter group notices in identi.ca
identi.catwitter
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As Wil has alluded to, that would require that your Identi.ca followers use the same handle as they do on Twitter. While this is likely, it is but by no means a certainty and thus unreliable.
The problem you present suggests that you don't follow that many people on Identi.ca. I would suggest enabling cross-posting from Identi.ca to Twitter, posting to Identi.ca that you're moving, and soliciting @-mentions on Twitter from those people so you can quickly find and follow them.
I don't know of a better solution at this time, I'm afraid.
If you go to the profile of the account sending the tweets there's a drop down (the gear). The bottom option of that is to report the account for spam.
Having reported the account you can then block that account so you'll no longer see the spam posts.
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Best Answer
As I understand it, the StatusNet software that Identi.ca is based on should support subscribing to Twitter but, last time I checked (maybe a year ago), they were still be working on making it performant enough to be enabled for installations as big as Identi.ca.