The few options I selected which my retailer tells me are a bit rare are:
1.
Leather steering column. I feel this is a must if you are ordering any of the extended leather interiors as it finishes it off nicely.
2.
Alloy gear lever - mine is a MT so I'm not sure how this works for PDK. I ordered a GTS, swapped the GTS interior to rid myself of the alcantara and noticed that the alloy gear lever was a no cost option! Win. It seems Porsche is fair when pricing options. GTS already had an upgraded gear lever hence the move to the alloy version was no cost. Aside from the cost part, it's a nice piece of kit. Do note that selecting this changes the leather boot to match the interior - in my case the boot when from black to graphite blue. This option is a must should you go with the alloy interior trim bits.
3.
Satin Platinum Wheel Finish - the configurator shows this to be might brighter than it is. I'd say it's a light graphite colour. Here again I wanted to deviate from the black wheels on the GTS but maintain something that was not too bright.
4.
Full Leather Package - while not odd, I do find most of the cars on the lot do not have this and I feel it's worth every penny over the incremental cost of partial leather. The stitching and leather on the dash/doors/console really set what is already a fab interior
5
. Aluminium Interior Trim Package - here again, worth every penny. Love how it lifts the interior and combined with the leather dash, you are left with almost no plastic in the interior. I almost opted for the black tint version but decided against due to how easy it scratches.
Options I regret not ordering, but are a bit frivolous:
1.
The colour coded key and key pouch: More for the key pouch. Like you, I have a two tone interior and the key pouch that comes from the factory is quite special. I've been using a normal black one and while a pain and likely only used for the spare key, I do wish I had the matching pouch.

2.
Personalized Floor Mats with Leather Edging - very frivolous. However in your case you could get the leather binding to match the beige leather. I'm a stickler for the small details but at the time of ordering I felt I ticket more than enough boxes and had to hold back.
Good luck with your order!
P