I don't think that's really necessary. Remember - you're working from the theoretical model of other aspects of the relationship being good enough to compensate for the lack of sex and/or intimacy. So you're good.

Whenever you feel sad that your husband/wife doesn't need you sexually, just tell yourself - "well, at least she did wash the dishes, and that's more important, surely". Whenever he/she rejects you, just say to yourself "yeah, but we got that nice walk in the park earlier, haha, joke's on you, I got the walk in the park and it's better than sex".

I mean I don't really understand what kind of advice you are asking for. Clearly you have decided and chosen to act out of the understanding that watching TV together is just as good, and obviously slightly better than sex, so what else do you need to convince yourself of? You already agree that gardening and knitting with him/her is good enough reason to stay.

Just be honest and consistent with your values. It is your value and understanding that ANY sort of companionship with this person is good enough. You already accepted that so your work is done. Yeah - do more hobbies, more roommate stuff together, meditate on the cosmic love that is abundant and somehow only manifests in the form of pizza ordered for you and left to stay cold on the counter for you as your partner has fallen asleep. Sometimes doing the shopping together is just the only sort of love and affection that you will ever get - be grateful for that and realize that there are people out there who don't have even that.

It's the business of choosing the lesser of two evils and compromising. Since you've chosen to go that route, make sure to fixate on fear. Fear of losing your roommate will keep you in check and will ensure that you never even think that his/her cookies are not good enough as to deserve a wedding ring and half your property. It's simple stuff - just believe in the stuff that you claim to believe and accept. You've chosen to live your life that way - fine, simply do it.