Well, firstly, you don't need a lot of time between tampons, technically -- so long as the absorption size isn't too crazy and you're changing them frequently enough. Secondly, fuck tampons, get a menstrual cup. For the uninitiated, it's a silicone doohickey essentially shaped like a bell that fits around the cervix. Learning curve? Yes. Squick factor? Probably. tons of sizes. Safer than tampons (see Toxic Shock Syndrome).

Pays for itself in a few months if you have heavy flow.

Bidet would be a little less necessary but still, if heated, v nice.

If I've had a rough second day I'll half-shower rinse, sure, but the merula xl is just about big enough to handle it otherwise.