You could use coax cable of ANY impedance if the cable length is a multiple of 1/2 wavlength, but that is not a solution for your wideband requirements. It would be VERY difficult to design transformers or matching networks for your targeted WIDEBAND frequency ranges, this will exceed the cost of 50 Ohm cable by a large amount.
You mention VHF/UHF in your document also, and cable loss matters at those frequencies.
RG62 is not really low loss: 10 dB loss @ 100 MHz per 100m
Example for an affordable with 50 Ohm and 5mm diameter, with approximately similar loss:
H155 would have 9.3 dB loss @ 100 MHz per 100m, cost is less than 2 EUR per meter
Of course, you can go for other 50 Ohm cables with lower loss at larger diameter.