While brainstorming for a senseful suggestion, i would like to give a probably useful advice: the Corporation Shop.
This works as a market shared amongst all players in a corporation where you can buy or sell artifacts.
My idea is to put a single station in the player's star system, capped at 1 per system, single-level, and buildable only in a free sector, where you can send a transport ship to access a tab where are displayed all artifacts sold by other corporation players at a player-set price, chosen between hydrogen or credits.
If this seems too op, i can say that you can add an option which for example a RS4 player can't buy a RS9 artifact (which is already ignored by diplomatic relationships), but only equal or lower levels.
This helps lower level players to keep up with the fast-enveloping environment at early stages, and also helps high-end players to upgrade their modules faster, which at higher levels farming can be a little painful (for example: lvl 9 laser needs 2500 units for upgrade, and most levels of artifacts give only 10 units (boosts excluded, but if included, still gives a maximum of 150/180%, 15/18 units more). Also, it helps you to target a certain category of artifacts you want to research (eg: weapon artifacts).
Last but not least, corp market should be available at RS4+.
What do y'all think? suggestions are welcomed ❤️