Best Battery Practice to reduce degradation in modern MacBook Pros

Hello, I have a recent (2018) MacBook pro which is used about 95% of the time in clamshell mode with an OWC TB3 dock supplying ports and power. The Mac is connected to two external monitors so you cannot disconnect the charger from the dock and continue to use the machine. I am concerned that the battery is kept at 100% all the time, my understanding is that keeping at 80% would improve it's longterm performance? I read somewhere recently that the charging algorithm for iphones will change to allow for this with the phone just topping up as the phone gets to the time that it is habitually removed from the charger. Is there anyway of doing something similar to a Mac- my mac is only used as a laptop infrequently - though this is an essential part of it's use- and disconnecting it from the dock and monitors just to drain down to the recommended 40% charge say once a month is a bit of a pain so I am looking for an alternative solution to keep the battery in best health. I suspect this would need a modification to the firmware which isn't going to happen, but I thought I would ask! If the batteries were not so expensive to replace I wouldn't be so concerned.

Thanks!