Would it be completely unreasonable to allow `fundrawtransaction` to use unsafe outputs?

I understand this means the resulting transaction may be invalidated whenever the unsafe output I'm relying one disappears (e.g. because the transaction that produced it was RBF-ed) but in my case that's ok, I'll react to that and re-publish the tree of child transactions accordingly.

But let me know if you think that's too much of a footgun for users, in that case I'll architect my solution differently.
ExternalSigner signer = ExternalSignerScriptPubKeyMan::GetExternalSigner();
         TODO: add account parameter
        int account = 0;
        UniValue signer_res = signer.GetDescriptors(account);
        if (!signer_res.isObject()) throw std::runtime_error(std::string(__func__) + ": Unexpected result");
        for (bool internal : {false, true}) {
            const UniValue& descriptor_vals = find_value(signer_res, internal ? "internal" : "receive");
            if (!descriptor_vals.isArray()) throw std::runtime_error(std::string(__func__) + ": Unexpected result");
            for (const UniValue& desc_val : descriptor_vals.get_array().getValues()) {
                std::string desc_str = desc_val.getValStr();
                FlatSigningProvider keys;
                std::string dummy_error;
                std::unique_ptr<Descriptor> desc = Parse(desc_str, keys, dummy_error, false);
                if (!desc->GetOutputType()) {
                    continue;
                }
                OutputType t =  *desc->GetOutputType();
                auto spk_manager = std::unique_ptr<ExternalSignerScriptPubKeyMan>(new ExternalSignerScriptPubKeyMan(*this, internal));
                spk_manager->SetupDescriptor(std::move(desc));
                uint256 id = spk_manager->GetID();
                m_spk_managers[id] = std::move(spk_manager);
                AddActiveScriptPubKeyMan(id, t, internal);
            }
        }
#else
        throw std::runtime_error(std::string(__func__) + ": Compiled without external signing support (required for external signing)");
#endif  ENABLE_EXTERNAL_SIGNER
    }
}
void CWallet::AddActiveScriptPubKeyMan(uint256 id, OutputType type, bool internal)