Gavin,
'Big Bounce' theories are very much alive and well, most a bit MORE consistent than the BB but none so far complete enough to confidently replace it. Even Penrose admits his 'Conformal cosmolgy' version has ultimate limits.
Also don't forget that accelerating expansion is still only a HYPOTHESIS! Sure it was popular when the (unseemly!) 'race' to produce it from redshift reported in with a winner, but that was hype. There ARE OTHER ways to produce greater redshift with distance, not generally adopted yet, but veracity in science is NOT a 'vote' system! This video explains one along with it's unique related wide consistency with OTHER findings.
Geometrical redshift from expanding helical paths. So we must always be careful not to assume any one theory as 'fact' to then preclude others.
On the matter of 'accretion' and recycling a widely consistent active galactic nucleus (AGN) model ('supermassive black hole' in old money) is able to reproduce the unexplained CMB asymmetries found. A published joint paper of mine describes it; though again with too many changes to old doctrine to be 'adoptable' as a new paradigm quite yet! here, or
HJ. Vol.36 No 6. 2013 pp.633-676.
Recent science across many fields and a number of essays here discuss 'continuum energy' or the dozen other names and wide evidence we have for this 'sub matter' state. Sure it may still take 20 years to become 'standard science' as did everything!
I've tended to read around 20 of the latest papers a week, and find I need to do at least that to keep up and get a coherent picture. Most supercede the old stuff most still rely on! It's a shame apparently even many professors may only read 2 a month! I hope that may widen your horizons a bit and not confuse too much! Do ask questions on the attached as well as my essay.
Best wishes
Peter