Monstera, to slice or save?

Alas, the support rotted out overnight and the whole thing toppled over.  The plant part is about 7 feet tall (not including the new leaf).  As I grew my Monstera from a tiny twig, the base of the plant is pretty thin compared to the topmost stem (which is a couple of inches across).  I either need to place it in a pot so the stem is several inches deeper than now (aka, a 10 gallon pot) or...

...and my heart breaks to even think of this idea. ..

...or cut it and hope it grows back from the base while I make new baby Monsteras.

Thoughts?

One possibility is, cut the roots at the bottom, take the soil (or get new soil) and heap up enough on the top so that hopefully the new, thick section starts rooting, and maybe prune the top to make it not fall over? I am not so familiar with Monstera so may be wrong.

I would try both.  Trim the root ball back by no more than a third and replant into a larger pot and use a new support.  I've rooted Monstera in the past and they tend to do well for me.  I can't see any "air"roots along the stem, if there are any you have hit the jackpot, those sections of the stem will root in water very fast.  Take a cutting that has at least one node and leaf on the stem and you will have a good chance of rooting another plant.

Heddwch

I trimmed off the air roots a couple of days ago as they had crawled INTO the wall when I wasn't looking. Only left a couple of inches of root behind.  One of them was nearly 4 yards long...possibly some got left in the wall.

That is probably why it fell