We’ve done this. Same issue as you it went over due to bonus. We called them and told them this was happening and they immediately said it was fine and agreed we would keep the funding
Yes you can put into the pension. If it’s salary sacrifice it’ll make your annual taxable amount reduce below the threshold. x
As long as net is under £100k you get the funding so just put in a chunk to your pension. For us we forgo the funding as having a huge chunk of cash tied up in your pension till you are late 60s is not worth the few hundred quid you save each month on nursery funded hours. You need to weigh it up
Speak to an accountant for advice