Large number of termination resistors and bi-directional signals
What type of (series) resistor?


Use the 4-in-1 0804 33 Ohm package example  is equivalent to 4x discrete 0402 packages. There are many OEM's; incl. Yageo, Panasonic, Bourns, CTS.



I don't know your assumptions for source impedance, no load rise time but the reflections only start when the total prop delay is greater than the rise time.

Some users get away without series R's https://blackmesalabs.wordpress.com/tag/fpga/