"Create" would do perfectly well as an alternative for "establish", and "transferring" could certainly be used, though I prefer "transmit" when referring to passing on knowledge. "Channels" might be used instead of "vehicles".

"Instancia", as you suggest, must be some kind of entity. Here are the meanings of instancia as defined in the DRAE. (They don't seem to include anything corresponding to "instance", though "instancia" is used in that sense in "en primera instancia" and "en última instancia"):

"instancia.
(Del lat. instantĭa).
1. f. Acción y efecto de instar.
2. f. Memorial, solicitud.
3. f. En las antiguas escuelas, impugnación de una respuesta dada a un argumento.
4. f. Nivel o grado de la Administración Pública o de cualquier institución política o social.
5. f. Persona o conjunto de personas que integran este nivel.
6. f. Institución, organismo.
7. f. Der. Cada uno de los grados jurisdiccionales que la ley tiene establecidos para ventilar y sentenciar, en jurisdicción expedita, lo mismo sobre el hecho que sobre el derecho, en los juicios y demás negocios de justicia.
8. f. Psicol. Cada una de las partes del aparato psíquico capaces de actuar."

The only one that really fits this context is no. 6, and I think that's what it must mean.

But I think it could refer to any kind of entity that serves to promote the tranmission or transfer of ancestral knowledge, so I would use either "vehicles" or "channels". I think "vehicles" may be slightly more accurate, in that it suggests some kind of institution, whereas a channel could be just a route.

Examples of "instancias de traspaso" on the Internet seem to come mostly from Chile:

"Aumentar las instancias de traspaso de información y discusión públicas, como las mesas de diálogo."
https://docs.google.com/viewer?a=v&q=cache:cPDueRuSbG0J:ambi...
(There's a pdf of this but I can't get it to open at the moment)

Here one of the "instancias" is a publication:

"Así mismo tenemos otras instancias de traspaso de información que son apoyos valiosos como la edición del boletín comercial de berries"
http://www.chilepotenciaalimentaria.cl/content/view/309679/F...

"As textbooks are one of the most common vehicles for transmitting knowledge from one generation to the next"
http://citation.allacademic.com/meta/p_mla_apa_research_cita...