Since Hookers Green is (always?) a mixture of more than one pigment, looking at the constituent ingredients on any tube of it will give you a good idea of the possible ways it can be mixed.

The aforementioned Phthalo Green + a transparent orange-yellow is probably the best mixing route. If you don’t have Phthalo green, then Phthalo Blue might work decently well. I would start with the yellow-orange first and add the Phthalo a little at a time because of its much higher tinting strength.

Dickblick.com on line has most brands of paints. Go there and click on acrylics, then artist acrylics, then Pebeo. They will show a list of the colors and a small sample of the color. To the left of Hooker’s green is a little paddle shape, click on that. It will show you a larger sample of the paint color, and a box will say “pigment”. Click on pigment and it will give you the list of colors in that tube of paint. Good luck.

Since Hookers Green is (always?) a mixture of more than one pigment

Nitrozo Green, PG8 is monopigmented Hooker`s Green. It`s lightfastness lays in hansa-naphthol range and it is more lightfast in oil. Many people ignore this beautiful pigment. I don`t know why. Other synthetic pigments are often less lightfast, but people widely use them.
Maimeri Oleo HD has pure PG8 in one of their greens. And some other manufacturers produce it.

Nitrozo Green, PG8 is monopigmented Hooker`s Green. It`s lightfastness lays in hansa-naphthol range and it is more lightfast in oil. Many people ignore this beautiful pigment. I don`t know why. Other synthetic pigments are often less lightfast, but people widely use them.
Maimeri Oleo HD has pure PG8 in one of their greens. And some other manufacturers produce it.

I was surprised to find Amsterdam Standard acrylics ‘Sap Green’ is not a mix using Phthalo Green (which is inexepensive), but PG8. Click on ‘pigment info’ :

http://www.dickblick.com/items/00643-7093/#PG8

If this pigment is nontoxic I might give it a try.

Hookers Green….. in Watercolour I mix Holbein Sap and Holbein Viridian to get Hookers.

How does it do in tints? I love this color, but I resisted buying the pigment dispersion because it is rated only fair in a tint:

http://www.guerrapaint.com/index.php?main_page=product_info&cPath=145_101_107_121&products_id=359

‘Course, maybe I could just not use it that way.

It isn’t “terrible” in lightfastness. It has the same lightfastness as PY74, PY3, PR112, PY83 e.t.c. In masstone it performs even better than regular naphthols or hansas. A guy, who tried to demonize this color just forgot about half of organic pigment collection that have similar lightfastness. Handprint recommended Phthalo instead, because in watercolor phthalo has better lightfastness and it is pure green. But oil paint isn’t a watercolor. PG8 in oil is a very brilliant color, many artists said that it is best green pigment from all green pigment line. Very deep in masstone like alizarin crimson, it gives outstanding gorgeous forest colors! And it has BWS-6 not BWS-5. It performs better than 5-6 BWS PY1. It will always beat hansas and diarylides.
Do not trust watercolor advice in oil. I said that many times and will repeat if somebody can’t understand: oil paint and watercolor paint are different things.