Hi OP, wishing you lots of luck for December.
It's an ever changing situation but keep positive and know that each Trust will have its own policies that can change on a daily basis. Maybe see what the Trust policy is nearer the time before you choose a birth partner? If they are allowing visitors then choose your mum but let baby's father visit at first opportunity, if you're comfortable. I think having baby's dad there to see he/she born or shortly after should help them connect?
Here's my pandemic birth story, I had my first baby in May:
Arrived in birth centre with regular contractions, after I was examined DH was allowed in from car park as I was 4cm. They told me I could contact him to let him know so I text him. Luckily I had my phone on loud with me in the bed still as he'd got to reception and the staff were basically just saying "no, nobody allowed. go away". So he called me and one of the midwives went out to reception to get him.
I was taken for an EMCS after various twists and turns over the next 7-ish hours, having DH there was a godsend. From support/reassurance for me, to contacting my mum (who would have been my 2nd birth partner) to let her know the latest developments.
He was allowed into theatre, held DS while I was sewn up, came up to Recovery as they wheeled me there but then had to go after 10 mins. I just remember asking if he could have even just 1 minute of skin to skin with DS and they said yes but it was clear we were pushing it.
I ended up being kept in for one week, only "allowed" to see DH once at the front door, even though he was dropping bits off for us every couple of days, I just cried in his arms for about 10 mins as I desperately wanted us all to be home together.
The midwifery team on the post natal ward were really stretched, more than one of them said this to me. The hospital usually allows 2 x birth partners and one can stay with you the whole time until discharge. So midwives are called upon much more for help with 'little things' that normally mums could ask whoever is there with them for help with.
In the current climate I think it depends on how your birth goes. Other FTMs from my NCT group were discharged within 12 hours and birth partners never left.
It is shit and I fail to see how partners from the same household, who have the same level of risk, can't be there from the beginning to discharge. May aswell go to the local pub to labour - lots of people allowed in there together!
All the best.