Type 2 and Christmas.

Two things to consider: high spikes may cause nerve damage in feet and eyes and getting back on low carb after you've fed your sugar/carb cravings can be very hard.

I opted for substitutes - not all of these every year but I tried them all.

Kohlrabi if boiled a little first makes a good roast potato sub. Or use cauliflower mash.
Use the meat/turkey juices instead of gravy.
Sage and onion mixed with ground almonds, sage, grated onion and seasoning for stuffing - add a little oil to bind if needed.
Make 2-3 green veg, eg brussels with crispy bacon bits and cabbage with butter on top and fill up on the meat/turkey.

A low carb fruit cake/pudding made with dried cranberries (unsweetened) and erythritol instead of sugar. I use a pumpkin spice mix as well as plenty of cinnamon and some fake brown sugar (erythritol based?) or ordinary erythritol and a small spoon of dark treacle.
Real egg custard or double cream.
Mincemeat made with a little apple pulp, dried cranberries, flaked/chopped nuts and plenty of spices, on pastry made with ground almonds.
Marzipan (ground almonds, almond essence and a little erythritol) covered in dark chocolate.
Chocolate mouse with double cream and 85% or 90% chocolate served with a few fresh raspberries.

I dry my own cranberries - buy at thanksgiving or near Christmas. Cut them in half, cover with erythritol and leave for a few hours, stir then dry for a while in a cool oven, and repeat each day until they are dried, store in an airtight tub in the fridge for up to a year. (you can put them in the oven after you've used it for other stuff). I take 3-4 days drying them.
I also made some dried rhubarb this year to add to fruit cake.

This is a useful article from Zoe Harcombe. I dislike the use of the word ‘cheat’, but the points made are good ones.

Loken said:

I decided that for Christmas I would take a the next couple of weeks off of the diet, being sensible and enjoy the Christmas period. Is this a wise decision or should have I decided to stick with the keto over Christmas?

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Good words of advice from the others.

My reply if you were standing in front of me asking that is:

A couple of weeks ????!!!!! If you really must, a couple of days is plenty. Certainly enough to trigger carb creep if you are susceptible to that. Are you sure you can stick to "sensible"? Be aware you may have to fend off "feeders" who like everybody to eat and eat, drink and drink, and devil take their health. But really - must you? Undo all your good work and self-discipline? When you can have glorious food that won't harm you?

Your health, your call. But don't kid yourself. Denial is more than a river in Egypt.

I too think 2 weeks is far too long. You'd undo all the gains you've made and it will be very difficult to just start again after.
I'm struggling with carb creep and weight gain after relaxing just a little too often and am finding it very difficult to get back the levels I need
By all means have a couple of planned and moderate tastes of a very few things you really miss, no more than 1 or 2 for 2-3 days max. Plan for what you will have, then stop.
The sugar hangovers, migraines, weight gain are awful, and that's just the immediate effects.
I, too, wish I could, but know my body would show me I can't

I agree with @KennyA two weeks is enough time to unravel, make new trends and since you have made such a great effort I don’t know if thats worth it. We all have different levels and tolerances but my “give in” at Christmas in the last four years has been on Christmas Day to have one roastie (only day of the year) and some h/m bread stuffing and a few roasted root veg but other than that I avoid everything else. I never felt liked eating with abandon for two weeks ever but I am not judging just saying what I do.