Sounds like a good idea given the likely demand. Stayed at a couple of NT sites last summer- both operating at reduced capacity, the Wasdale site also had additional portable toilets, everything very well maintained. Hoathwaite much more basic, portacabin toilets a bit grotty but regularly cleaned, separate portable showers which are ok. I think Hoathwaite charges £12/night for a small tent, which is good for that location. I wouldn’t choose a site that didn’t have showers. Hope that helps.