If you would like, you will need to set a config option to " use_pre_wildfire_text_font" yes - remove the quotation marks!!!!
and copy this attachment into the C:\Program Files\PTC\Creo 2.0\Common Files\M190\x86e_win64\text\usascii or where ever your load point is
this is the modified version of the ascii.fnt for 64 bit workstations. Make sure this is used on a 64 bit machine - it will crash a 32 bit machine.
It has the seraphs on the 1 and a / thru the zero.
(rename the original ascii.fnt to asci_orig.fnt)
As you can see, it was used in my past life for many years.
We switched to ISOFONT about 5 years ago and all the complaints stopped.
Be sure to redo your template files and the tables in your template drawings, too.
I use Arial. Similar to Helvetica, but more ubiquitously available; e.g. it comes pre-installed on all windows machines. Add "pro_font_dir C:\Windows\Fonts" to your config.pro, or it won't be among the available options. Without that line, Creo only has access to the fonts that came with it, not all the ones on the machine. (CG Triumvirate is also similar, and comes with Creo. But, I think Arial is preferred, as it doesn't need to be embedded or stroked in PDFs.)
I looked at this very hard several years ago.
I found the distinguishing characters L, I, 1, & l are each differentiated where there is no ambiguity in the ISO30985FONT font.
O and 0 are still very close, but there is still differentiation.
I find the mono-space of ISO30985FONT useful.
I also stroke all fonts for drawings.