I hope this isn't rude or odd ... then get green Bancha ... easy peazy ...
I am actually serious about this as Bancha is extremely forgiving.
I was simply offering a way for you to have the sencha you like in a simplified way which you want for the office. Either that or develop your intuitive side to brewing so you do not need things like scales, timers, thermometers and the like.
In TeaChat discussions we often branch out in our discussions ... and try to figure out different ways to approach problems in order to find solutions. No offense was intended.
Virtually any good sencha is going to require a bit of attention to detail though you can go in a more Western style brewing of it and it is more forgiving.