In a previous question the case about if a turnback would be feasible, specifically for a single engine aircraft, has been analysed.
But given a twin-engine general aviation aircraft and a single engine failure immediately after lift-off, considering that my Pilot handbook says:
A continued take-off is not recommended if the steady rate of climb according to "Section XX" is less than Y%.
Considering the quite dangerous setting, I would say that is quite impractical to go and check that table in such a situation.
What kind of indicators might I look for to check if it safe to continue? Should I learn by heart such table? (I am not sure this is practical either, is a quite complex table)
In case I am unsure what to do, apart from trying to climb for a while then turn around or immediately try land in front of me (granted that there is enough space), are there, generally speaking, other options?
In the accepted answer of the listed question is said that
It's not reasonable to try it [a turnaround] without knowing what altitude is needed for it at current conditions.
is it possible to estimate this quickly inside the cockpit?