I switched from Lantus for the basal (long acting/slower absorption) and Humalog (fast-acting) for bolus (mealtime shots) to Humalog for both. A pump will allow you to microdose the humalog for small releases while Lantus does that by itself in your body
I was faced with the same issue of having too large of basal + bolus insulin-units on a daily base to utilize the lifespan of omnipods (3 days + 8 hours if you want to really stretch it) but decided to do only the basal with the pump and continue kwikpens for bolus. This way I was able to maximize the lifespan of the pod since I am cheap (or thrifty?) and did not have to deal with carrying around that extra PDM to schedule/trigger the bolus with the pods. Just my good old KwikPens which are faster and pretty discreet in public imho.
Since then I was able to lower my insulin dosage and I am doing more and more bolus shots from the pods not to waste pods or insulin. You just need to sit down and do the math of how it would work out for you, which way to go. Usually physicians like clear plans and numbers they don’t have to come up with themselves.
And as elver said, Omnipod is working on U2-U5 certification. But if you know what you are doing in regards to your units and understand U2-U5, it is already doable without recommending it obviously. But the KwikPens I am using are U2’s and the Humalog ampules for the pod are U1’s and I am doing bolus-shots from either one.