I would advise against it. Even if your target publication venue allows it, and even though DOIs can remove some of the resulting guesswork these days, it really isn't best practice. The "traditional word-by-word abbreviations" you mention are not just traditional, but prescribed by the ISO 4 standard. Sticking to the established convention instead of introducing a new standard should be preferred when feasible, especially when it leads to providing clearer and more readable citations, especially in the long term. Of course, I also know the pains of tight page limits, but would recommend shortening more elsewhere first.

I would advise against it. Even if your target publication venue allows it, and even though DOIs can remove some of the resulting guesswork these days, it really isn't best practice. The "traditional word-by-word abbreviations" you mention are not just traditional, but prescribed by the ISO 4 standard. Sticking to the established convention instead of introducing a new standard should be preferred when feasible, especially when it leads to providing clearer and more readable citations, especially in the long term. Of course, I also know the pains of tight page limits, but would recommend shortening more elsewhere first.