Import Cisco ACL(2000+ rows) from Cisco ACE to F5

Without AFM you can migrate ACL's to iRules or Network Packet Filters.

However, both are is going to be a lot of rules, very complex and extremely difficult to manage post migration.

If you can get an AFM license will be easier in the long run or look to migrate some or all the ACL's to the F5 connected switches or a network firewall somewhere.