So 2 nights ago I watched Only The Good (the official one I believe, as opposed to either of the alternate endings).
This is where Lister, the Cat, Kryten & Kochanski escaped into the mirror universe before Rimmer came back through and got trapped in the decaying Dwarf, kneed Death and ran off (to where, I have no idea).
Now, this ending could jive with BTE, since in those 3 eps, we had hard-light Rimmer back (with no explanation of course), but, we would now be in an alternate reality to the one we had for the original 8 series'
The alternate ending I liked, where after about 50 trips back & forth through the mirror, Rimmer finally remembers the "formula" to stop the virus, they save the "prime" Dwarf and let the crew float off in the escape pods as Rimmer salutes Captain Hollister as only he can.
This ending would of course cause problems by having a very alive "live" Rimmer at this point, but they'd be in the same reality they always were.
The 2nd alternate ending was something like the vending machine still firing a can at Rimmer's head, but I don't remember this one as clearly as alternate ending #1. Maybe someone can expound on this ending a little better.