I had a similar client request and have been in touch with SiteAttention.
EDIT: SiteAttention 2.5.0 seems to be compatible with Epi 10: http://nuget.episerver.com/en/OtherPages/Package/?packageId=SiteAttentionModule
But none of the previous SiteAttention versions (including for 7, 8 and 9) have been compatible with Blocks (only pages). I put SiteAttention in touch with Allan Thraen at Epi to try to kickstart support for blocks, so I'm guessing they'll try to fix both Epi 10 and blocks compatibility.
Will update if I hear any news.
We have just started an upgrade for a client to version 10.3.
They currently use SiteAttention but there doesn't appear to be any new updates that are compatible with version Episerver version 10.
Had anyone and idea if SiteAttention should work on the latest version or if there are any plans to upgrade it?