is it possible to access suiteql from salesforce without a restlet?

You need to either use the native rest API or create your own restlet

thank you

Yep. Just post to the rest api. curl --location 'https://ACCOUNT.suitetalk.api.netsuite.com/services/rest/query/v1/suiteql' \ --header 'Prefer: transient' \ --header 'Content-Type: application/json' \ --header 'Authorization: OAuth r' \ --data '{ "q": "SELECT .... " }'