I have been thinking that I may have to rethink the use of 20mm as the primary scale for the Alcovia project. Though there are a few models available in 20mm/1:72 that are not found in 15mm, these are few and 15mm supports the scale well. The main thing that 15mm does seem to lack is suitably modern infantry models.
Even those models that there are are relatively few and far between. QRF and Peter Pig both do 15mm modern Russians, but these are all good up to the 80s/90s and both of very generic and aging castings. The 20mm miniatures I have seen go all the way up to current Russians and have much more character in them.
A plan comes to mind to use 15mm for larger scale battles in the open regions of Alcovia, played out on typical 4'x6' or 4'x8' tables at the company level and play the 20mm stuff at the platoon level on 2' x 2' or 4' x 4' board that focus in on a block or two of close-in fighting.
As it stands I already have three T-55s and 3 BTR-152s in 15mm leftover from an aborted project or two.
When it comes down to it, I still want to work with some 20mm miniatures as I never have worked with them before and it does bring back a certain nostalgia from my childhood when I bought box after box of 1:72 models and figures.