Reforge

You need that treaty, even if just because even if 4 corners is gouging you on the terms, at least they won't be atacking you ad they'll keep Derexes atbay. You certainely dont want a war on two fronts.

1)Allow them to extend but in carefully choosen positions. Honnesty you gain to have acess to their comm network.

2)Accept but with a couple of years of non comercial aplications and non disclosure time attached to the bigger stuff (ie a time in which they canot use the tech for direct commercial use or transmit to anyne outside their own organsation). Hopefuly by the time that's over, you'll have made new progress in the fields and kept your edge.

3)Sort a table of ranks appropriate to various adventurers grades, some of which will be mostly honorific or circumstancial. With some leeway to account for experience in the field.

4)No on full access /for now/.
Partial access (either limied to X generation or by family branches) may be granted under supervision , with deeper access to be specificaly asked at a later date.

(It's a good way to not give them acces while still leaving the door to authorise later AND they'll have to tell you (or at last give you a hint) what they are looking for)

5)Recruitement :Accept, but you want the name of the citizens given to you before the observation period and possibility of either veto (at a max ratio to be negotiated) or to use mind alteration to remove any confidential kowlege the 'candidate' would be in posession of should they accept the four corners offer.

6) Accept with terms and limitation as discussed previously.

7)Accept. With condition the interview may be recorded (even if the reccord is sealed later)