I was wondering if there are any platforms that I could use.

If not, do I have to code one for myself? My coding knowledge isn't too great - It would take me about three days using javascript and HTML.

I would really appreciate it if somebody could give me some help or possibly even code one for me  .
Or could anyone give me the code for a landing page that they have already created (I'll edit it of course so it doesn't look exactly the same)

Thanks

Before you do that, do you know your the private key of the your wallet that is stuck in ethereum mist wallet? because if you have it backed up might be possible to access your wallet without downloading the sync data at all. Just obtain the unencrypted private key from mist then copy paste it on mew to access it there or back up your keystore folder from etehreum mist and try to access it on mew.

That was one of the reasons why I've switched to a HW wallet that I use with e.g. myetherwallet.com.

That is normal because there are many transactions happening in ETH now and it will really take a long time for it to resync and that is one of the reasons why I hate that kind of wallet when it comes to old coins. If you don't want that, use their web wallet that is more convenient to use but it is more vulnerable in phishing. It is fine though just enter your private key on the original site of mew. Transfer your funds at your myetherwallet after sync is done with your ethereum mist.

exodus is a non-web software wallet that works with both bitcoin and eth.
It has a nice GUI and you have your keys with you.
Jaxx is a more open source alternative.