How to add large CSV table that is searchable and allows for adding more data?!?

I’m having to migrate 4 sites over to wordpress and one of them was a huge searchable database (over 90,000 entries) built with straight PHP pages feeding and receiving data from a MySQL database.

I’m having trouble figuring out how to import the MySQL table (in CSV form) into my new WordPress site, have it be searchable by the public, and to allow adding more data to it on the backend.

I’ve gone through tons of plugins that might let me do one or two of the above requirements but I’m not seeing any way to do everything I need. Due to my hosting situation, I do not have access to phpMyAdmin, otherwise I would just import the table from the old server to the new one. I need a way to import all of my data, create a form on the backend to allow for adding data, and have it be searchable/sortable using the WordPress environment.

Any help would be greatly appreciated!