Bob, Clive et al ,
Can't say where you'de get Wood alcohol, it's not listed in "Martindale" which is the pharmacists bible of what's available world wide.
However if it needs an alcohol either isopropyl would do or surgical spirit ( ethanol with a bit of methanol and castor oil thrown in so it's toxic if you drink it ) or methanol ( "Meths" this just has (from memory) Pyrogallol added to it to make it more toxic and give it a purple colour to put you off drinking it).
I suggest using surgical spirit as the castor oil and methanol won't hurt machines. Dissolve it in this and add to your suds SLOWLY so it's dispersed into the liquid. That way although you're diluting the alcohol and it will start to crystalise out, there should be soo much water around that it will mix in. Thymol does dissolve in the oil phase of the suds quite readily so shouldn't be too mich issue.
Personally use neat cutting oil although I add about 25% parafin to give it some cooling effect. Seems to work OK for me, does pong though not as bad as suds gone off.
Good luck Ian