Welcome freazyx, thank you for contribution and for your interest in the project.
About the RTP Replacement, the purpose of the replacement is to make games depending on original RTP assets make them work with a free replacement.
The particular ChipSet (tileset) part of the RTP replacement wants to display similar terrain types and objects from existing ones in the same position as existing (world, facade, inner, dungeon and ship).
Because your art has custom tiles not existing in the original RTP assets, they are not strictly 100% suitable for all tiles to replace, however we would like to have additional (non-standard RTP) assets for future games created in the EasyRPG Editor, which is not ready yet. This means we could provide a new package with additional assets for new games, not just for replace missing files from games already made which require RTP.
We can accept files with a license allowing any use by requiring attribution (give credit mentioning you) even in modified assets. The CC BY 4.0 license we use for existing RTP Replacement contributions already suits your conditions, which can be accepted.
Some tile sets used already have portions from multiple authors. Some of your object tiles and autotiles (e.g. red floor autotiles, rock, chest, etc.) can even fit for the dungeon tileset.
By the way, carstene1ns is part of the development team, there is no a strict or vertical hierarchy in the development team.