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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.