Humm...do you happen to have access to Y results that are charted and sourced back to him or to a more recent Richard? Please post anything reliable, if possible. Of course, we'd want to accumulate a set of at least three matching results to rule out some non-parental event in the line.
Wikitree still has no Y results for the Richard Hubbell line, though some autosomal results (like mine with a tiny trace for one of the Richards of the American branch from colonial times.) So far not seeing anything on the Big Tree which is a global Y project (https://www.ytree.net/
I bet the Hubbell Society would know the Y-DNA marker, given that they are in touch with living Hubbells/Hubbles that descend from the Richard line of American progenitor Sgt. Richard Hubbell: https://www.wikitree.com/wiki/Hubbell-16
Sgt. Richard was supposed to descend from the Richard you mentioned.
The Hubbell Society is doing some DNA work and lists ways to contact them at their webpage.
also there is the FTDNA Hubbell family study. Their data is not posted openly in public, but there are contact emails which one could try:
Hope you can somehow figure it out and share data on the Richard Hubbell line!