Ok, I figured out the WHOLE problem! Really I just needed to spend some time around understanding the logic flow between the dialplans and various contexts....

What Broke Things:

I created a dialplan called [autopatch] to handle my outbound calls and referenced that as my context in rpt.conf, thusly negating the context referring to [radio] but allowing for outbound calls to function.

This _WAS_ my [autopatch] stanza in extensions.conf that allowed for outbound calls to function but helped break call park pickup:

<extensions.conf>
[autopatch]
exten => _1NXXNXXXXXX,1,Dial(SIP/FOOBAR/\${EXTEN})
exten => _1NXXNXXXXXX,2,Congestion

And what broke the rest

<rpt.conf>
[43265]
context=autopatch

The above caused the logic to flow as:

{*6XX... DTMF} -> [autopatch]

and of course in the autopatch stanza there was no handling for anything other than a phone number preceded by a 1.

The fixification(yes it's a word now!):

context=radio back into rpt.conf instead of the former!

<extensions.conf>
[pstn-out]
exten => _NXXNXXXXXX,1,Dial(SIP/FOOBAR/\${EXTEN})
exten => _NXXNXXXXXX,2,Congestion

This then allows for the following dialplan path with the given *60701 DTMF:

{*60701 DTMF} -> [radio] -> [check_route] -> [parkedcalls] -> {happy N0PKT haha}

This also goes to pstn-out when the correct pattern (DTMF) is matched etc...

Not super detailed but enough info that hopefully it will help someone else out in the future!