The risk of scoring slowly is that two quick wickets bring scoreboard pressure and NZ get bowled out short of the total. But if they get 150 in front, it won't be a 2rpo chase. It forgoes the chance of putting up a 250 chase in 65 overs, but let's face it -- the likelihood of that happening anyway is quite low anyway.
That's where strategy comes in for me, these two should be working towards a plan around the result they want to bat towards and break that down in ten over considerations, the reason I say that is, say these guys do manage to bat past the reverse swing stage and into the new ball tomorrow, they bat another 40 overs on where they are today - if they only score another 70 runs, we're still 100 behind and the Windies get another crack at us and we probably go into a shut up shop session in which we know players like Taylor, Neesham, Rutherford and our tail end are just not good at defending ball after ball after ball.
If they accelerate, and take say 130-150 off those 40 overs - then you're in a situation where you're only 50 runs behind when the new ball hits, hopefully you manage to restrict the success that the tiring bowlers have during that period. Then you're giving players like Neesham, Taylor and Rutherford an opportunity to go out there and take on a tiring bowling attack and accelerate the scoring above and beyond the three or so an over that should be manageable by these two.
Yes, it risks the potential of a wicket, and yes, planning for that eventuality puts a lot of faith in the idea that these two can stay together for another 40 overs - but if you're not planning that way and you're simply looking to soak up time, you're giving yourself less options later in the innings to make it hard for the opposition to win.
In an ideal world, we end up being around 240-270 for 3 at tea time tomorrow, deficit erased, new ball into about its twentieth over and tiring bowlers in the opposition side.
If we're 150 for 3 at tea time tomorrow - still around 100 behind their score, all the pressure remains on us.
That's the risk/reward nature of test cricket and why I think the idea of just pottering along at 2 an over simply won't do.