Pelly, those of us who have checked with traditional priests with experience on this issue have conveyed all the information you need. No offense, but you insist on relying on your own malformed deductions.
1. Most importantly, what miniscule amount of gluten may be in a Particle of Holy Communion will not affect you because you don't have celiac disease.
2.
I'm not keen on fractioning as it could rob time from my staying with Jesus.
This is a heretical and ridiculous idea, that the bigger the Host, the longer He stays with you. The size of the Host is immaterial. Please review Church teachings on the Real Presence immediately.
Talk to your traditional priest about receiving a Particle of Host. Then go to Mass and receive without worry.
3. Re: Gaps - you can follow a healthy gluten free diet without necessarily following Gaps diet. Your choice. It's easy and relatively inexpensive to have good health.
4. Re: special enzymes.
** You don't need special supplements to receive Holy Communion.
If you have a particular circuмstance regarding fasting /abstinence, then your priest will advise you.
** If you want enzymes for overall health (a great idea), you can buy good quality at any vitamin center or online without a prescription.
Please speak to your local traditional priest as soon as you can. With respect, you are overly scrupulous and need spiritual counseling and direction from a priest.