Tom - I have the soft key, but thought I didn't need it after seeing the K3 specs. Why would you depart from that measurement? ;-)
The T-R output MOSFET in the K3 is rated at 200VDC at around 5A, so it should not be much of a concern for switching. Additionally, the MOSFET is diode-protected against reverse spikes from the relay it's keying. HOWEVER... this having been said, were it me, I'd add an (internal) Lo-voltage keying interface, like that offered by Harbach, to change the T-R keying voltage presented by the SB-221 from 120VDC to around 2VDC and maybe a couple mA of current. Pretty economical and easy to install, and worth the effort to install.
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