I have generally been assigning canonical names (like "15.60") for still-lifes that have been exhaustively searched, and ad-hoc names (like "45-bit still-life #1") for ones that have not (or, more recently, for 25+-bit ones that have been seached, but for which I don't have the list myself). For oscillators, I often used similar ad-hoc names like "24-bit period four oscillator #1", but I have been slowly trying to convert these and spaceships to the Pentadecathlon nomenclature (like 24P4.1 or 20P7H1V0.1), or its equivalent when the patterns aren't actually on the Pentadecathlon list. Unfortunately, since the suffix assignments are arbitrary, there's no objective way to name them, but this is rarely a problem as the number of oscillators and spaceships is usually fairly small.
(By the way, you will likely have an easier time if you replace the two separate one-bit sparks at the bottom with a domino-spark; the results are the same in the next generation).
It might be possible, but I doubt it would be easy. The 4-bit spark at the bottom left is basically an "insert a block via broken toad" method; I know of several of these; unfortunately, about half of them use a predecessor that would hit the block first, and all of them require gliders that come from the direction of the block. I suspect that a large random 3- or 4-glider search might find some suitable ways to make this.
The things on the bottom center will be more difficult. To get the single bit to appear beside the block, it would require a massive overloading just below the block.
Here are some feeble attempts; these would require a lot of work to fix:
1) Generation -11: 3-glider collision making "broken toad" (glider placement will be problematic)
2) Generation -2: 2-generation predecessor (which does not kill one bit that absolutely needs to die, and does not provide the two lower 1-bit sparks; it also interferes with the broken toad)
3) Generation -1: one-generation predecessor (which makes what we need except for bottommost bit)
4) Generation 0: your predecessor (replacing 2 bits with dominoes)
5) Generation 4: first phase of oscillator appears
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