If you're mainly using the MCP, it could be worth making your own MCP that uses your own API keys from Brave, Mojeek & Marginalia (optionally also add Yep). For the most basic ranking, get it to group URLs that appear in more than one search engine and list those ones at the top. Your favorite AI will be able to vibe-build this all for you and give you an exe / binary you can run as an MCP that runs locally over stdio.

If you try it out, you'll either find a replacement that saves you money, or you'll at least have the makings of an escape plan if you need it later. You'll also have your own comparison data for where Kagi beats a generic metasearch, and if that difference is meaningful for you.