welcome... your set for some fun
yes, you can do what you want with scripting.
basically you need to just route midi/in/* objects to midi/out/* objects (cc,keybd)
if you place these in a subpatch, and in the settings make it a polyphonic multichannel, and select the max number of voices (16).
(ive not tested this, but it should work, as this type of subpatch receives all midi channels)
this is not identical to a midi thru, but its possibly close enough...
if you cant to do a strict midi thru, this is possible by altering the midi script (or my midi thru object), basically you just need to alter the status byte ,
int8_t out_channel = 0; // channels run from 0...15, not 1-16!)
status = status & 0xf0 + out_channel;
please note... sysex cannot be forwarded in this version of the Axoloti firmware.