It's a really clever solution, so long as the damn things don't pick up exogenous DNA from the environment. My bet is that we'll see a lot more cool mods like this as sequencing and synthesis both bottom out in price.
Microbiology is pretty much the wild frontier of genetic engineering right now, not least because it's the area of biotech with the least onerous regulation. This is something that gives me a bit of bitter satisfaction, given how said regulations are sold in terms of managing risk and how bacteria are, you know, tiny and fucking everywhere.