A bunch of chip resistors in parallel to ultimately make a T-atten.

The whole point of wirewound is that I can make a T pad with 3 5 Watt
resistors.

They make "flange" attenuators but they cost a fortune in small
quantities.

Not really necessary for HF ops.

The only advantage to using individual resistors, is to reduce the stray
reactance. That goes way out the window with WW. Inexpensive solutions
often revolve around buying surplus 1/2 watt or larger axial Carbons and
arrange them in parallel to achieve the required values. This also helps to
disperse the heat generated. The parallel resistors are soldered close to
the body to Brass or Copper stock to improve dissipation. Also consider
that although tune up will require 100% duty cycle, CW is 50% duty cycle and
SSB is less. Check the Math in the Allied or ARRL book.