DHCP via Two Domains -- one network ?

I need to keep both domains running for 2+ weeks since
my 50 employees are sometimes remote, therefore I cannot
do the entire cutover on a weekend/etc and do NOT want to
migrate my current 2008 domain since it is messed up/etc

Are step #3 and #4 valid ?
What recommendations do you have ?
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STEPS
 1.  keep my ONE "DomainName=domain1" Windows 2008 SERVER
      running DC, AD, DHCP, DNS, VPN, FileServer, and NOTHING else
 2. setup a 2nd "DomainName=domain2" Windows 2012 R2 SERVER
     running DC, AD, DHCP (with different range then above "domain1",
     DNS, VPN, FileServer, and NOTHING else
 3. change 1st employee to new domain, no VLANs/etc,
     causes employee to get DHCP from the "domain2" server ?
 4. 1st employee can still access \\domain1\srvrFiles, but will
      need to enter their "domain1\username" credentials ?
 5. after all employees are moved over, getting DHCP from
     new server I will then move \\domain1\srvrFiles to
     \\domain2\srvrFiles and remap drives if needed