(Attachment Link)
Thank you for that schematic. So, what diodes are you using? would those be two "normal" diodes? since I didn't see them as zeners or schotcky.
If so, would signal diodes also do, i.e. 1N4148? Since I am going to use very minimal mA

For the NPN transistor, I have available for easy purchase the following:
(Yes, I will be doing two versions, one THT and one SMT),
It will not dramatically increase the cost, and would help "debug" where a potential problem may be when the other people do not have a basic understanding of electronics - and don;t need to either. So this will help a lot :-)
ON Semi KSC1009YTA - THT $0.074AUD - 100pcs - $7.40AUD B160V / E140V <- Will be going for this
ON Semi BC546BTA - THT $0.116AUD - 100pcs - $11.60AUD B80V / E65V
ON Semi BC546CTA - THT $0.071AUD - 200pcs - $14.20AUD B80V /E65V
ON Semi KSP06TA - THT $0.139 AUD - 100pcs - $13.90AUD B80V / E80V
ON Semi MMBTA06LT1G - SMT $0.108AUD 50pcs - $5.40 B80V / E80V
FMMTA42TA - SMT $0.067AUD 50pcs - $3.35 B330V / E300V <- Will be going for this
Infineon SMBTA06E6327HTSA1 - SMT $0.052 100pcs - $5.20 B80V / E80V
Edit:
Added more SMT options.
Edit 2:
Link was correct for FMMTA42TA, but had MMBTA06LT1G in its name. Oopps, sorry.
Thank you to everyone that has replied, as I was not aware of this option.