I'm using an Arduino nano 328P with the old bootloader.
This display: LCD-Anzeigemodule online kaufen | eBay
I connected everthing according to this schematic. The SD-card is simply attached to the hardware SPI lines in parallel with ili9341 as cs pin I chose D2.
Your suggestion about using the hardware SPI for the XPT2046 (touch controller) seems like a good idea to me and I already thought about doing so myself, but I was scared away by it's datasheet, not mentioning that the chip is spi compatible.
Anyways I will try that and report in as soon as I'm done.
Thank you.