I have it!

εὕρηκα! I have it!
After being completely stuck on my last verse last night (I should have liked to rhyme 'angel' with 'salvation', but unfortunately I think Derbenov is actually referring to God when he talks about the Earth also having its own guardian) I got rhymes for all the translations on my way to market this morning: 'guardian'->'protector', 'stretch out'->'extend', 'invisible'->'undetected', and 'end'... simply 'end' ;-D

And from that I was able to work backwards quite quickly to fit in the whole thing...

All Shall Be Well

( Translation completed )

I'm currently quite pleased with the way it came out, which I think gets across the flavour and shape of the original lyrics while providing a pretty close translation -- *and* fitting back into the tune provided ;-)

Watch on YouTube

Original lyrics: https://lyricsonline.ru/36293-igor-nadzhiev-moy-angel.html

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( Literal translation )

( Verse translation )