Using own SMTP server with GSuite

We’ve been having problems recently with our email ending up in junk and after doing some testing it turns out that (some of) the GSuite IPs have been blacklisted, which explains the partial deliverability.

E-mail is very integral to our business so we’d happily pay to have a dedicated IP but Google doesn’t give that option.

Is there a way to force outgoing email to go through a custom SMTP that we’ll setup with another provider that can offer dedicated IPs?