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There are multiple solution available for converting DBX to PST file format. you can google this solution . Last time i used a solution for same issue and got great result with this tool. i will recommend you to download this software from here https://www.sysessential.com/dbx-mbox-converter/
I have read your problem and come to know that you are looking for the best software and was irritated by manual methods. So, in my opinion, you should go for DBX to PST. Being a daily migrator, I know the solution will work on your problem.
Be aware that some of these posts are making the (incorrect) assumption that DBX from Leica is a Microsoft Outlook file. If any link leads to a page mentioning Outlook, it's not going to help you.
Thanks Terry, yes I picked up on that.
Still Outlook Express does not run any update windows if you are using any new update window. you can try MS Outlook email client. Still MS Outlook many future updates in an email, therefore, MS Outlook email fast for Outlook Express Email client. If you want to convert email data that you can use DBX to PST converter Tool who can converts DBX files in PST file format at some minute.
Visit here: http://www.softwaretoconvert.com/dbx-to-pst/
Found this way of doing DBX to PST file conversion quite effective.
You can use ToolsGround DBX to PST Converter to convert Outlook Express DBX files to Outlook PST. The software is completely secure and convert multiple DBX files to PST in bulk.
More Info;- https://www.toolsground.com/dbx-to-pst-converter/