Alder coppice for copious creations?

A brief description with some questions.

Around where I live, we have several trees that I figure can be easily coppiced, but I doubt that any can compare for production with the Alnus Alnubetula, also known as Green Alder, Slide Alder, and Mountain Alder.  Some call it Alnus Veridis.

This tree species is small, never getting to be tall like most trees around here, and tends to flop over in arching ways due to the often heavy snow load.  Some classify it as a shrub, but most as a small tree.  It naturally forms multi-stemmed clumps that resemble an untrained/unmanaged coppice.  I’ve seen as many as ten mostly equal stems coming from one center.  The bent-over stems from one tree can take up a large area; maybe a circle with a 30-foot diameter.  Stems near creeks, lakes, or rivers can be ten inches across, but away from abundant water, they tend to be three to five inches each.  Water-based trees tend to have fewer stems for some reason.   It is a nitrogen-fixing species that allows it to grow and regrow rapidly.  It is a soft wood to cut, but it hardens significantly upon drying.  The wood is good for carving, smoking meats, and chipping for creating mulch from what I’ve read.  

I’d imagine it might be good for biochar production.  

I’m building a trail up the mountain behind my place, and a grove of alders can be quite a mess to navigate through, much less plan and build a trail.  In this setting, they tend to be in open areas in widely spaced out poplar and birch groves, but they can also be in adjacent conifer forests.  

When possible, when building the trail, I have chosen to go on the high side of the alder tree clusters which also coincidently happens to be the North-ish side.  My thoughts are that the tree, given that I have chopped down some of the stems on the north side, will put most of its energy into the Southern stems away from the trail toward the sun.

Perhaps with coppicing, I can manage these trees so that they tend to not need continuous jungle clearing?  I guess that is question one.

Question two is that, given the sprawling nature of these individual clumping trees, is it a valuable choice to plant it as a coppice tree considering that it fixes its own nitrogen and thus will likely grow back faster than others, or does the space that the tree takes up tend to make it not worth it?

Questions 3 and 4 :   Is it better to, perhaps, interplant the alders with the birches, willows, vine maples, and other potential coppice species in order to utilize the nitrogen-fixing qualities for the greater ecosystem, or to try to plant a grove of Alders by itself?  The alders growing in my ditch tend to grow at much the same rate as the other deciduous trees there and tend to be supported by the other trees in a more upright, but still multi-stemmed pattern.  Since Alders take up a lot of space, I’m wondering how close I can interplant them, and whether that will encourage their potential coppice production.  The ditch seems to indicate that it is possible.  Every few years I have to cut them down in order to see out my driveway down the road.  

Does anybody have experience with alnus alnubetula coppice?