>> Have you thought of using a short length of resistance wire - can
>> be  purchased (here locally) at 1.73 ohms per metre.
>>
>>   
> At 5W it may light up with a cherry glow before the solder melts and
> it falls off, or sets something on fire. Also Temp Coef. may not be
> good for measuring current

Several strands in parallel would get down to 0.05 ohms and add bulk.
I've done this a couple of times to make medium-power shunts

For example, 13.77 ohm/m nichrome (7.26cm/ohm). 0.05R is only
3.63mm but 10 strands 3.63cm in parallel -> 50mR. Or 20 strands
of 7.26cm

Nichrome or Cuprothal will have published temperature coefficients
that can be used to assess whether changes are significant
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