Step 2 is a problem, not impossible, but would require a substantial mining investment. If i took all of my $X000 investment in mining gear I would be able to do that about once a month and it would not be guaranteed each time I solved a block.
But, if you're mining anyway and can steal a couple hundred extra bitcoins half the time you solve a block; this is a pretty good scam.
If you're creating an orphaned block then you wouldn't get the 50btc... so your whole reward would be the stolen coins.