Help To Buy ISA last chance, is there any point?

[user1374384]

Martin Lewis warning anyone who doesn't own a house to open one ASAP as the deadline is this month. However, I have a LISA instead which will also give me 25% on a first house and it doesn't have the limitations of only saving £200/month that the help to buy has, and I believe it can be used for a deposit which is difficult to do with the HTB. So am I right in thinking it's pointless for me to open HTB in addition? The last chance warnings are making me doubt myself. It is my understanding the bonuses can not be used together when buying a house?

Money Saving Website say that LISAs tend to beat HTBs but are less flexible. Info is here.

DD has just taken a HTB one out but she's just under 18 so a LISA wasn't available to her.

I have a HTB with Barclays. It has a good interest rate of 2.58% which is more than any other savings account, and you don't get penalised if you take out the money for something other than a house. Could yoy theoretically open one with £1 before the deadline, use a LISA for main house savings, and use the HTB as an easy access savings account for the interest rate?