Is there a better way to setup 2 different accounts?

Can anyone tell me if there s better way to setup 2 accounts? Here’s the background. I have a public email address that’s an outlook.com address and a private Gmail address. I forward all of my outlook emails to my Gmail account as I want to prevent my Gmail account from being discovered by spammers. Right now I have K9mail setup so my Gmail account is the fetching mail server and my outbound SMTP server is my outlook just in case someone would decide to view the original message showing headers. From a setup standpoint in K9Mail my outlook address is my account name and I’ve been able to set the SMTP address up as OATH2 by first setting up the account with my outlook address setup for IMAP and then changing the Fetching server settings to be my Gmail address. My problem is that I can’t setup K9Mail to have both accounts as OARTH2.as it seems to want both the fetching server and the outbound addresses to be the same so right now my SMTP is OARTH2 as it was configured that way initially but my Gmail address is setup as password authenticated.

What I’m wondering is whether I’m doing this all wrong. What I’m wondering is whether I should setup my Gmail account as a second account but I’m concerned about the ramifications of having 2 SMTP servers defined. Can you have two IMAP accounts going to the same, combined consolidated inbox? Can I setup the GMAIL account either initially or after configuring it for OARTH2 so it has no SMTP server so that all of my outbound mail still reflects my outlook credentials?

Right now what I have works but I fear that sooner or later, just like my Outlook account Gmail will require that that account be setup as OARTH2 instead of authentication through a password as it’s configured today.

Any advise or alternatives will be appreciated.

I’d have an IMAP account for your gmail, and a second IMAP account for your outlook set up in K-9.

You can configure the Outlook to never retrieve email.

Both should be set up for OAUTH2.

When you reply to a gmail, you should be able to change the From: line and send it via Outlook.

You can compose a new mail from the Outlook connection in K-9.

Note that some email headers from Google may get carried forward and might be seen by one of your contacts when you reply.