If you wanted to automate this process and put it in a script: (it assumes all your dvm-based vms contain dvm in their name)
qvm-ls --field=name,template,class | grep AppVM | grep -v dvm | awk '{print "qvm-prefs " $1 " template " $2}' | sed 's%deb-10%deb-11%g' > tmp
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