36 Invar is apparently free machining version of Invar
I machined this and Kovar some years ago making parts for some of the large network builders. I found it OK to turn with (HP coolant helps - we ran about 3000 rpm about .02mm/rev feedrate on 8mm bar down to 4mm turned diameter) but not great to drill with as material tends to "stick" to drill points. We ended up feeding in and out as opposed to conventional rapiding to counteract this. M2 size of tap likely to be too small for more secure thread milling process so possibly use roll tap .