It was easy!

I just slammed a couple of 100 ohm 2W carbon film resistors in
parallel on the output SO239 of a SWR meter, and powered it from a CB
transceiver. Center contact by plugging crumpled, twisted leads into
hole. Grounding with help of a tiewrap. Extremely low SWR. The 2x
2-watt resistors became quite hot at 3W RF carrier after 10 min.
keydown (well... let's sat 3 min.
"mike-PTT-kept-pressed-by-rubberband").

I made the T2FD 400 ohm resistor as 4 "squares" of 4 x 100 ohm
resistors, soldered as a series of diamonds. Painted in high
temperature engine black paint. Will go inside a generous ABS project
box, weather sealed but with weephole. Will hang asymetrically, to
point weephole down. Ball of crumpled alu foil should help keep bugs
out, yet allow dripping.

Nominally, that would be 16x2=32W. Derated to 1/3 (say, 10W) should be
still OK with up to 30W RF out @ 100% duty cycle, down to the minimum
frequency.

It probably could take more at low duty cycle or higher frequencies,
but I won't put in anything more, as the balun I made includes 60V
neons between feedpoints and ground, to provide paranoid clipping of
pulses from nearby lightning strikes.

If matching is fair, they'd clip at about 70W, as impedance referred
to ground is 50 ohm. OK for QRP or for typical surplus 20W manpack
operation.