The Academy of Historical Arts does not recommend or condone the use of made-up heraldries in club logos or any artwork on behalf of the organisation or its affiliates. In Scotland, it is illegal to use or claim heraldry unless it has been registered through due legal process.
Heraldries that you have registered through the Court of the Lord Lyon in Scotland (or through the College of Arms elsewhere in the UK) are perfectly acceptable, as you have followed due legal process with these designs. Go ahead and use them!