What about adding a Trig TN72 to an existing TT21 transponder installation?

Will this combination provide ADS-B out?

Yes, I do already know that the TT21 is not certified for ADS-B out.

I have read some other threads about the TT21 being the same as the TT22 with the exception that the TT21 does not meet power output requirements for 2020 ADS-B output.
However I also read on a previous thread that originally ADS-B was supposed to be phased in 2 levels, and that the TT21 was made to be useable for the lower level of ADS-B out, and that level is no longer going to be an option.

So I am curious/ interested if the TN72 work in combination with a TT21 and provide ADS-B out, recognizable to local traffic, even if not a the required output wattage?