there isn’t a single famous Canadian astrologer who uniquely “updated” Canada’s foundation to 17 Apr 1982, 9:35 AM — that time comes from the actual proclamation ceremony on Parliament Hill (the Constitution Act was proclaimed on 17 April 1982) and a number of astrologers (both Canadian and international) have since used that proclamation time when casting a “birth” chart for modern Canada.
Who explicitly uses that 17 Apr 1982 ~09:35 proclamation time (examples):
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Jessica Adams (astrologer) uses the April 17, 1982 proclamation time in her write-up about Canada.
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Several astrology writers who discuss Canada’s “patriation” chart (and favour the 1982 proclamation as a valid national birth moment) include Mel Priestley and the site AstrologyEH — they treat the 1982 proclamation as a legitimate alternative/updated chart for Canada.
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The 9:35 a.m. / April 17, 1982 timing is essentially the astrologically useful timestamp of the Queen’s public proclamation on Parliament Hill — the historical/proclamation record is held in Library and Archives Canada (the proclamation itself and contemporary accounts of the April 17 ceremony).
If you want, I can:
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show a short list of astrologers (Canadian + international) who explicitly publish charts using 17 Apr 1982, 09:35 (Ottawa), with links and short excerpts; or
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cast comparative charts (1867 midnight vs 17 Apr 1982 9:35 AM) and point out the major differences (rising sign, key angular placements, Sun/Uranus, Neptune, etc.).