First of all I've never used Lantus; just Lente, Ultra Lente.
Next, I'm not a T1.5...
BUT...
to answer some questions: I started off on 8U TDD (including Regular). Then i went through the honeymoon phase (no insulin), then I went back on insulin for the rest of my life, in 1979. I can't see why you can't take a small amount of Lantus to slightly reduce your fastings, Lili.
Mary is a 1.5 and she gets insulin 24/7--just not a whole heck of a lot!

Her daily basal is around 8U, which is even more units of basal than what I started on in 78.
Bottom line: if you can't get an Rx from the doc, try another doc.