I bet he never has any problems getting paid at the end of the job, who's going to refuse to pay a guy with an axe :)
There's an American guy on YouTube that uses an axe for tucking in,cheaper than a speedcat :D
This might make more sense
Stairrods now do a divider profile, I've been using a similar one primarily for mattwells, but also on the odd single step, it fits under the ply...
Quickstep lyvin do one similar to what i think you mean
I'm not certain, someone else will probably know better, but maybe cold weld
What is the depth of the stair tread? An undersized tread may cause you to kick the riser, every time you walk up the stairs. Having the stairs...
The festool ks60 is worth a look, if you fancy spending a bit more, it's as good as the ks120, just smaller, which makes it a bit more portable...
Just out of curiosity, which tools are you intending to buy?