http://www.hgfa.asn.au/HGFA/overseas_pilots.htm#

You can sign up for HGFA membership (including the three month version) and sign
the HGFA waiver at the link above. No need to deal with PDF's. No need to sign
these forms at the registration desk for the competition. Just do it on-line.

All competitions should have their waivers on-line.

Here's another option if you receive PDF's in emails that you can print, sign ,
scan and email back to the meet organizer:
https://www.fillanypdf.com/