I can give you an alternative suggestion to how you can run your large contracts without any issues:
Instantiate your contracts on EVM and using Evmos you can interact with any blockchain in Cosmos to interact with the contract hosted on EVM, and not Cosmos.
I dunno whether Terra Luna Classic has a channelId yet since the L1 Team isn’t answering that question clearly about whether they have any channels open or a Tendermint client is running or not to provide IBC connections. I have to assume that it is not the case and that it might be required to run a Tendermint client in order to do that.
If you have the devs and the server resources then you can run your own copy of the Tendermint client with connections that might work with Evmos, but this is something that we need to try and check. Can’t say for sure unless we try it in code.