The rack mounts are easy to make them at the place where you want the rack to come, see below the description, let us know if you want us to send M5 aluminium M5 riverts by post? Most of the bicycle shops should have it
They would need to find aluminium M5 rivets for the frame, same as what one uses for bottle cage rivets.
This is what they look like:

They need to drill to the size of the rivet to fit into the frame tightly.
Then use a rivet "gun" that looks like this to press and fix it into the frame.

One gets various shape and style rivet "guns".
They are used for various industries and easy to get.
На мои опасения ответили так:
The frame is made from aluminum, nothing will happen to the frame.
What is important is to drill the hole matching the size of the rivet to fit into the frame tightly.
See below the location of the hole (the degree 70.5 is pointing to the hole). The location can be slightly shifted, this is not a problem, important is that it will match the location of your rack.
Let us know if you are coming right or not.
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