(a) Shouldn't there be a take off distance chart somewhere
There used to be but the baby was thrown out with the bathwater a long time ago when the old DCA manuals (and the initial GAMA manuals with the Australian extra data) went the way of the dodo.
(b) be aware that the US GAMA manuals are part FAA-approved and mostly, not.
(c) for a first approximation with different speeds/configurations, distances can be factored by the ratio of the speeds squared
(d) main problem is to have a good story for the enquiry if you come unstuck. ie, if the strip is anything near what the the POH suggests you need, then use the POH data configuration.